I'll say it for the 100th time.
Start small.
Put Storm in BP2.
That's.....not really small though. Storm was in the 2000 movie....she's in "Dark Phoenix", which comes out this year.
Not saying she's as played out as Wolverine but none of the core X-Men are "starting small". We've seen these characters for damn near 20 years, which is why I said go with X-Factor or X-Force. Or Excalibur. The New Mutants would be another good example if it wasn't already a movie.
Or hell, they could even do Team X which features some minor character we've already seen (Maverick, etc.) but also allows them to introduce villains they've never used before, like Omega Red.
They could also introduce the Shi'ar Empire in a Guardians Of The Galaxy movie....which again, gives them a not so obvious route to introduce the X-Men.
Fred.