In my mind this movie only works if Mark Hamill is in it. If Rey looks up to Luke enough to call herself “Rey Skywalker”… show us that relationship!

Have Rey’s new Jedi Order established on Anch-To, and since the location is stong with the force or some other bs reason, also give me force ghost Luke training Jedi too and having fun teaching with Rey and guiding the students.

It can even be a smaller role that book ends the movie. There’s a threat, Luke helps train students more and gives advice, Rey leaves with students and uses Luke’s guidance. Aka, don’t be afraid to use Luke and still make him a participant in rebuilding the Order!

For example… see “Professor Binns” in the Harry Potter novels, but not as boring.