My rollout for X-Men that nobody asked for (TL;DR I know):
Stinger: Black Panther 2 gives us a look at T'Challa coming across Storm in Africa.
Stinger: Doctor Strange 2 maybe having Doc's mind be touched by Xavier, as Doc hears a protest outside the Sanctum.
X-Men Main Movie:
Act 1: Sentinels are the baddies. I’d have this be a very small ambition movie. Gotta change the sentinels too, they are just too big. Maybe have them be large, but look more humanoid and have more weapons, kind of like a modified war machine. This is the primary conceit of the movie – the sentinels were designed by Trask using stolen Stark/Iron Man tech. Open on a young character not in the X-Men, heck just start it with Jubilee like the animated series. She encounters a Sentinel sent after her, there is a long sort of escape/meet up with the X-Men who destroy it.
Act 2: They determine that it’s Stark tech which is driving the sentinels, so after some quick intros, they go to Avengers headquarters in the Blackbird to get information that can be used to destroy them without fighting. This gives us a chance to see them use their powers – Beast and Wolvie sneak around, Jean helps gain entry by distracting people with the mind trick, Blink gets them through walls, Storm makes it rain outside to cover their landing, etc. They get the tech, but somehow trigger an alarm and have to fight Sam as the new Captain America and Spider-Man. This gets us into the MCU. They have the normal super hero fight where they fight for a bit but then they somehow end up talking about how Avengers tech is being used to hunt and capture or kill mutants.
Act 3: It’s determined that they need to go to Trask Industries who make the Sentinels and corrupt the data they use to power them. Spider-Man decides to go with, since he’s young like the X-Men and doesn’t want to leave his fellow Gen Z’ers out to dry. They go, mop crap up, and with them fighting a horde of War Machines it could give a lot of screen time to the powers and abilities of each person. Maybe an X-Man like Wolvie takes a direct hit for Spidey and gets really hurt, and once he’s back on his feet later everybody is BFF’s now but they still have to keep everything on the down low to avoid legal complications because the Avengers are a government sanctioned body. Stinger: Bishop comes back from the future, because hey I just like Bishop. That’s one for BryceC.
I do worry about the X-Men in the MCU though – they’ve gotten by on humor and the fact that all of these characters are badasses who all look good and are smart. The X-Men is a group that is a group of literal outcasts, and many of them are pretty grimey. You can’t make a Thor: Ragnarok with X-Men IMO. They’ll have to go pretty far to break my trust at this point though.