All of your ideas sound fantastic! (Weren’t you working on a new novelization a while back? Is that still a thing?)
But yeah, for this edit, we’ll have to think a little smaller. I’m not too worried about future movies though - kind of like how I’m handling Rey’s parents, I’m really just side-stepping the issue, rather than explicitly going against canon. If future movies want to give Finn Jedi training, it could be like how Ahsoka handled Sabine, making her a Jedi even though that wasn’t part of her story in Rebels.
I appreciate the feedback! Thank you!