Adding the X-Men and F4 in the MCU... How?

With Infinity War and the cosmic conflict that was filmed without Disney owning the rights for the Fantastic Four and the X-Men, which means no sign of the first family and the Mutant Rights Advocates that happen to be a sort of superhero team... But now that Disney has the right to use them; how do we add them to the mix.
Some people say add them "later". Me? I say they have always kinda been there...

For example, let's say that The Fantastic expedition happened around the time of say, Thor. Something something, the cosmic storm causes the crew of the Fantastic to end up in Skrull space. Captured by the Skrulls, who begin studying them in order to ensure perfect disguises of humans for their invasion of Earth, the 4 discover their powers. With the aid of Capt. Marvel, they escape and return to Earth shortly after the Aftermath of the attack on New York.

They decide to keep their powers secret from the world. Nick Fury swears secrecy thanks to something Capt. Marvel gave Reed. Fury gives the F4 full control of the Baxter Building, a S.H.I.E.L.D research facility whose former research lead was assassinated  (Mary Teresa Parker) alomg with her Husband (Captain Richard Parker)

Reed's research uncovers a rare mutagenic material that could revert Ben's mutation, but is located deep within the Atlantic Ocean. After discovering Atlantis, and getting involved in an Atlantean Civil War, the Fantastic Four help the Amnesiac King Namor regain his spot as the Ruler of Atlantis. (Between Winter Soldier and Age of Ultron.)

After the events of Age of Ultron, the Latverian Emperor, Viktor Von Doom begins fortifying his small nation from attacks. Reverse engineering the Ultrons, he creates his army of Doombots to protect his city from attacks. As he delves into the arcane arts, he finds a way into the quantum realm and is trapped there.

Reed decides to visit an old Mentor of his, Hank Pym, in order to bounce back ideas on how to cure Ben from his affliction. (Adter Civil War, but before Infinity War.) Instead, Pym, suggests that maybe the cure for Ben's mutation may be within the Quantum realm, not to mention that an expedition to that realm would be charting a map into the unknown... and to find some closure for Janet.

The Four enter the Quantum realm and end up in a pocket dimension where Von Doom has recreated a New Latveria where he is a sort of God Emperor Doom. At first, Doom acts friendly towards his former classmate and his companions. He even "cures" Ben from his condition. Eventually, the F4 discover that not everything is what it seems. This pocket dimension was enslaved by Doom and turned into something it was not. A small rebellion led by Janet van Dyne enlists the help of Reed, Sue and Johnny. Ben wanted to stay out of the fight, since he's no longer The Thing. Since time doesn't operate normally in the Microverse, Sue's pregnancy has been accelerated when Thanos snaps his fingers. As Doom, Ben, Sue and Johnny begin to fade away, a small bubnle shields  the Four and Doom. This is being done by the Baby, Franklin as he begins to force his way into the world. Agreeing to a truce, Doom helps Reed to deliver the baby. Usong the last vestiges of his power Doom seals Franklin's powers and escapes. Swearing revenge on the F4 for ruining his plans of Multidimensional conquest.
The F4 would be able to return home after endgame, where the new Illuminati invite Reed to join their group.

For the X-Men, well that's  a bit tougher.
I would start with a series of webisodes starring our favorite angry and stabby Canadian before becoming an X-Man.
Have a WWII short where Corporal Logan from Canada is given a mission to aid Captain Rogers on Captain America: First Avenger. Maybe even have a scene where Logan walks past Cap (back turned to the camera in order to hide the fact that it's not Chris Evans) who seems to be chatting up with some soldiers.

The next short could deal with Logan's distraction mission, which involves rescuing some prisoners from a concentration camp. He even saves a young child named Max Eisenhardt (better known as Erik Lehnsherr) from death.

The following short involves Logan traveling Japan to pay a debt to a Mysterious man known as Ogun. He is trained by Ogun in the ways of the shadow warriors. Logan betrays Ogun, when he discovers that the latter is uaing him as a dog of war to wreak terror in Japan.

The next short involves Logan returning to his homeland Canada, where he stumbles into the Wendigo and stops the creature using the Muramasa blade. He gets captured by Dept. H and some of Logan's former contacta from the CIA.

The next short is a hyper summary of Logam becoming the tenth attempt to make a Super soldier to surpass the (believed to be) dead Captain America. Logan escapes into the Wilderness but is being followed by a tracker named Victor Creed.

The next short is in the nineties, where Logan, now infused with adamantium and his memories scrambled is working with S.H.I.E.L.D. to protect a young scientist named Mary Teresa Fitzpatrick from the Mercenary known as Sabretooth. His S.H.I.E.L.D. liaison is Lt. Richard Parker. After defending Fitzpatrick, he suggests that Parker should ask her out. Logan finds a suitcase with the S.H.I.E.L.D. insignia, the Wolverine suit, and a brickphone. Fury calls to get him into the Avengers Initiative,  but Logan refuses. Fury tells him to keep the sneaking suit.  (Tan and brown)

The final short is in the mid 00s where Logan is living on a cabin in the middle of nowhere near the Alaskan frontier, where he's visited by Charles Xavier (with Cyclops, Storm, and Nightcrawler) to be recruited into the X-Men. Logan suits up after saying: If I'm gonna join your circus, might as well dress up like a clown)

Now for the X-Men movies. First one takes place in 2006 Xavier has his first class of students: Jean, Scott, Hank, Bobby, and Warren. Their Baptism by fire comes in the form of Cain Marko, a man imbued by the Ancient powers of Cyttorak. The Unstoppable Juggernaut is hellbent on killing his stepbrother who abandoned him in an ancient temple in the Mythical Savage Land of Antartica. The budding X-Men have to take the fight to the Savage Land, where not all Members are able to return home.

The second movie takes place  in 2009 with Xavier recruiting more mutants to Return to the Savage Land after Xavier receives a telepathic message from Jean telling him that Lehnsherr is alive and has taken her and Hank prisoner.
The X-Men face Magneto in the Savage Land, when aliens show up and kidnap the X-Men due to the Phoenix force manifesting within Jean.

Third movie takes place around 2012. The Shi'ar allow Jean to live and send the X-Men home. In reality, the Shi'ar simply sent them to Mojoworld, an intergalactic prison world, where prisoners live "normal lives" as the equivalent of television shows. The Phoenix allows Jean to be the first to see through the illusion and she awalens the X-Men and other Earthling Homo Superior that Mojo had kidnapped through the ages. (Mojo has an obsession with Earth culture)
As the X-Men begin to free Mojoworld's prisoners, the phoenix begins to warp Jean's mind and she becomes Dark. The X-Men are forced to fight Jean. In the end, Jean sacrifices herself to send her teammates home safely. The X-Men arrive to Earth on 2018 when Thanos snaps his fingers.

I know it's a bit of a cop out to have them off-Earth but it's the only plausible way to have their adventures. As a bonus, we could say that the Fox movies WERE canonical as "a couple of Mojoworld's shows. The characters looking different could be chalked as "alternative art style" for the show. Also, the whole Mojowprld could allow nods to other weird X-stuff like Arcade, the Brood, Sentinels, etc.