Ooft, here’s an idea for an ending. On the back of Outbound’s flipped movies idea, with Luke only dying near the end of the third movie, how about this:

Kylo has his memory intervention and throws his lightsaber into the sea. End for him.
We cut to a truncated version of the Rey/Leia training - this is happening as an epilogue. Leia sends Rey off to train, and we get that training montage cut to match the following (cut from her training with Luke and a couple of other sources) “Who am I? No-one. Someone. Light. Darkness. Life. Death. Warmth. Cold. Peace. Violence… Balance. Energy. I am the force.”
Cut to credits.

[I’m not trying to imply she’s the living force, with that, so much as accepting that she’s accepting that the force is balance, and flows through her. “I am one with the force, the force is with me”]