Hmmm. I do think removing Rey’s parents from as much as possible generally seems to smooth things over nicely. Whereas TLJ is about revealing their devastating ordinariness, this movie should be about showcasing Rey’s own extraordinariness:
“I pushed you in the desert because I needed to see it… I needed you to see it… who you are. I know the darkness that lives in you, Rey…”
“You’re lying.”
“I’d never lie to you. Your parents were no one. Junk traders expecting a child they never wanted.”
“Don’t!”
“Your parents, Rey… they had no part in your conception…”
“I don’t want this!”
“…just like Vader.”
“No!”
“You’ve seen it, haven’t you? Your destiny.”
(Rey sees the vision of herself on the Sith throne)
“Luke saw the same fate in me. But you and I don’t want it.”
“Stop talking.”
“Why? I know you better than anyone else.”
(Cutaway to heroes capture)
“Palpatine knew your true potential… your power. The first time we fought, in the forest, the darkness inside of you awakened. You revealed yourself to the Emperor that day… just as he intended.”
(Visions of Rey beating Kylo on Starkiller, falling into the dark cave, etc.)
“No!”
(The mask of Vader falls to the ground)
“So that’s where you are.”
“Before your Jedi path, Palpatine wanted you alive. I’ll come tell you why.”
“Rey… I know the rest of our story.”
“Tell me.”
"The Emperor manipulated the Force itself into creating life. My grandfather, and then you. You’re his chosen heir… a rightful Palpatine.”
"The Emperor wants us to fight each other so his strongest heir may claim the throne. He hasn’t realized the depth of our connection, Rey… a bond, not of blood, but shared power in the Force. We’ll end him and the Sith, and create a new order, together…”
(I’ve opted to remove “finish what Vader started” only because it’s a matter of interpretation whether Vader wanted to end the Sith or merely take on Luke as a Sith apprentice. As for the reference to the dyad, this would come from Palpatine later on since I don’t want him to start giving Rey a vocab lesson. He could know what the dyad is at this moment, but it’s better if he doesn’t mention that word specifically.)
“What are you most afraid of?”
“Myself.”
“Because you’re a Palpatine. Leia knew you shared the same struggle as her.”
“She never told me. She still trained me.”
“Because she saw your spirit. Your heart. Rey… some things are stronger than blood. Confronting fear is the destiny of a Jedi…”
“She was quick to learn in our training. But Leia feared the darkness that had lived in our father, and lived on in us. She surrendered her saber to me and said that one day it would be picked up again…by someone with the strength to overcome that darkness.”
So, at this rate, this edit would use Rey Nobody as a base (except for when she confronts Palps). This would be the most TLJ-friendly version of Rey Palpatine. But I’d want to mirror that shot of BB-8 because it would trigger me otherwise lol. It doesn’t even make much sense the way it’s currently implemented since the camera would be inside of the wall of the Falcon, and the other side of the room is too close. Mirroring the clip remedies both issues.