OK, to include characters in cannon in the future you would have to choose individuals that have immortality or regenerative abilities that grant the same equivalent.
To my readings these individual could still be around by then: Painkiller Jane Jessica Jones Andrew Bennett Deadman Etrigan Solomon Grundy Wonder Woman Frankenstein Deadpool Wolverine Dracula Thor Mr. Sinister Vandal Savage Candra Ra's Al Ghul
Of those one could speculate these individuals might be involved with the USCM: Vandal Savage in some sort of leadership role Painkiller Jane Jessica Jones Deadpool Wolverine Arguably Ra's Al Ghul in some sort of spec ops leadership role.
The following characters already have Aliens crossover comics: Superman Batman Archie
This is more of a speculation on how you could incorporate crossover comics into the main story line and not skew the timelines or cannon any.
_________________ The impossible takes a while longer and goes over budget too...
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