I actually had an idea for remaking TFA to completely 100% change Luke’s character to be actively involved with the New Republic. There’s footage that’s usable with him interacting on ships in space. Which would mean no exile…or at least not in the same way.
This would cause a domino effect that would require a lot of editing of all 3 films…but I think it’s doable.
Alternatively, I think making “Episode 6.5” is also doable, showing him before Kylo snaps.