The Moira X concept was pure genius

I always loved the "origin revisionism" that Alan Moore used for SWAMP THING. It was a masterwork.

And I loved to see the same principle/technique applied to the X-MEN. The Moira X concept was pure, pure genius.

I just hated how they used Moira in the last part of the saga, turning her into a cyborg villain. Well, that's it.

That said, we can apply a variant of the concept to Earth-10005. In my scenario, Moira discovered that she wasn't able to age like a normal human. So basically, the Moira MacTaggert scientist (The Last Stand) is supposed to be the same Moira MacTaggert CIA agent (First Class). She can't age, or just age very slowly, and then became a scientist through the decades. Cerebro is not able to "classify" her as mutant, even.

That would also explain why Xavier and Alex were so surprised when they encountered her at the beginning of X-Men: Apocalypse, and they clearly stated on-screen that she still looked young after 20 years.