I had one idea called epilogue, where I just took footage of the original cast from these films, in order to tell what happened to Luke, Han and Leia.
The other idea was to repurpose Rey, as a more Revan type character.
She’s a sith with her mind wiped at the beginning.
The other proposal is to wait and create footage when deepfakes, Voice emulation (a vocal deepfake) and realtime raytracing advance more, don’t hold your breath.
With that I feel it’s a matter of properly layering it, a 3d tracked model so as to get the proper shape of the head, a lot of the work will be automated, but it will still be difficult to do, at that point, I don’t know if these films are worth it.