I think we’re pretty much on the same wavelength at this point, and it’s actually a solution that works with the film quite well, minus the explicit ‘Rey Palpatine’ stuff. I would actually also cut any mention of a Dyad, since it is barely in the movie and Force draining can just be a secret power of Palpatine like Force lightning was in ROTJ. In this version, we don’t really need a lot of exposition about Rey’s past, since it can be essentially the same as TLJ. The only added bit would be to explain Ochi and the dagger, and since it’s definitely a Sith dagger, that means that Rey’s past has to have an element of the Sith interacting with it.
“Rey….wherever you are…You are hard to find.
“You are hard to get rid of.”
“I pushed you in the desert because I needed to see it…I needed you to see it…who you are. I know the rest of your story. Rey…”
“You’re lying.”
“You were right…your parents were no one. Worthless scrap dealers from nowhere.”
“Don’t!”
“You remember more than you say. You knew they were never coming back.”
“I don’t want this!”
“You hated them for it.”
“No!”
“But you couldn’t live with your hate.”
(Cut Rey’s vision of her parents…since they are nobodies.)
“You lied to yourself…but that only made your hate stronger.”
“Stop talking.”
(Cutaway to heroes capture)
“Rey, I know how your parents died. They were drunk, on the far side of Jakku, when they were found by an agent of the Emperor. He wanted to know where you were…but your parents couldn’t even remember.”
(Cut vision of Rey’s parents getting killed.)
“So that’s where you are. You know why the Emperor’s always wanted you, Rey. I’ll come tell you.”
…
“Why did the Emperor come for me? Why did he want to kill a child? Tell me.”
“He never wanted to kill you, Rey…he saw what you would become…a powerful host for his corrupted soul.”
“Palpatine told me to kill you, but I know the truth. You are his true prize. There is darkness in you Rey, far more than there is in me. So don’t play his game. We can kill him, Rey…together.”
(Removes his helmet)
“You know what you need to do. You know.”
“I know.”