How would you do it ?
I would do something along the lines of thinking back to X2 & Wolverine never escaped the mansion attack lead by Stryker & instead of escaping with the rest of the X-Men X2 & X3 all happened in Wolverines head & Wolverine has actually all this time been captured all of this time & is being experimented on again & Stryker has given Wolverine some kind of drug to make him think he escaped etc & X4 starts with one of Strykers people going soft & goes to the mansion & tells Professor X & the X-Men (with Scott & Jean alive) since their deaths did not actually happen & some of the X-Men goes to save Wolverine while the rest of the X-Men takes care of Magneto who is waiting to strike again. This would keep X-Men 4 in true false fashion all about Wolverine & at the same time we would have Cyclops & Jean back & Gambit can be introduced being experimented on like Wolverine is etc & all of that stuff.
I would do something along the lines of thinking back to X2 & Wolverine never escaped the mansion attack lead by Stryker & instead of escaping with the rest of the X-Men X2 & X3 all happened in Wolverines head & Wolverine has actually all this time been captured all of this time & is being experimented on again & Stryker has given Wolverine some kind of drug to make him think he escaped etc & X4 starts with one of Strykers people going soft & goes to the mansion & tells Professor X & the X-Men (with Scott & Jean alive) since their deaths did not actually happen & some of the X-Men goes to save Wolverine while the rest of the X-Men takes care of Magneto who is waiting to strike again. This would keep X-Men 4 in true false fashion all about Wolverine & at the same time we would have Cyclops & Jean back & Gambit can be introduced being experimented on like Wolverine is etc & all of that stuff.