This is the Fan-film you are looking for https://youtu.be/owrmLeX20CY
That film is outstanding. I intend to use it either in place of, or as a complement to, Force-Han appealing to Ben to leave the Dark Side behind. I’ll likely insert it at the point where Rey skewers Ben and he’s on the cusp of death. He blacks out and has a vision, which would be a segment of the short film.
The film’s concept of Kylo killing Vader would be my reedit’s version of Ben conquering the dark side. (Earlier in my 3-in-1 mashup, I’d have the scene where Kylo’s trying to wrench secrets from Rey’s mind, and she tells him he’s afraid he’ll never live up to Darth Vader.) When Ben comes to, either Rey’s gone and he’s managed to survive, or else he comes to just as she’s reviving him.
I could also splice in shots of Leia meditating/unconscious, implying that she’s sending Ben the vision.