I like the way this is going, so don’t take this rewrite as a critique, but just playing around in the sandbox of ideas.
“I pushed you in the desert because I needed to see it…I needed you to see it…who you are. The dark side is your destiny. Rey…”
“You’re lying."
“I’ve never lied to you. Your parents were no one. Junk traders who abandoned their child.”
“Don’t!”
“They abandoned you for a reason. Don’t you know why?”
“I don’t want this!”
“They saw your darkness.”
“No!”
“They feared you, and your visions.”
(Rey sees the vision of the throne)
“They left you on Jakku…where they were found by the Emperor’s assassin.”
“Stop talking.”
“He killed them…but he wanted you.”
(Cutaway to heroes capture)
“You know that the power of the Dark Side has always been there, Rey, as long as you can remember. The night we first fought, in the forest, that power was awakened…the power of the Emperor.”
(Rey sees visions of the forest, her power)
“No!”
“So that’s where you are. You know why the Emperor always wanted you. I’ll come tell you.”
…
“Why did the Emperor come for me? Why did he want to kill a child? Tell me.”
“He didn’t want you dead. He saw what you could become. So he poured his dark power into you…changed you…to be his rightful heir.”
“You’ve become a Palpatine, like my grandfather before me. But he doesn’t yet realize what he has created. Our connection…it’s a power like life itself. We can destroy him, Rey, and bring a new order to the galaxy…together.”
“You know what you need to do. You know.”
“I do.”
…
This takes the previous idea that Rey is a creation of Palpatine and adjusts it so that she was changed after she was born by Palpatine’s influence, as Palpatine could see the role Rey would play in the galaxy. This comports even more with TLJ’s ‘Rey Nobody’ concept, where the only thing that is special about Rey is that she is in the right place at the right time during TFA. Palpatine had her parents killed so that they wouldn’t have any second thoughts about retrieving their child, and this allows Rey to still believe that her parents may have some redeeming quality.
Explaining that Rey was changed into a Palpatine after her birth also leaves open Anakin’s origin. He could have been a Skywalker like his mother, created in opposition to the Dark Side, until Palpatine took notice of him at the age of nine and turned him into Hayden Christensen, which would explain why he was so unequivocally good before that point. Similarly, Rey could have been a nobody with struggling parents until they landed on Jakku and Palpatine foresaw a future where she would be an ideal candidate for his spirit, at which point he gave her visions which drove her parents away and kept her there until the time was right for her dark power to awaken.
This idea also allows for Rey to keep the personal revenge plot, even if her parents weren’t intentionally protecting her from Palpatine. Rather, her parents got rid of her because she was already being influenced by Palpatine’s power, and that scared them enough to get rid of her. This also gives Rey a much more personal reason to hate Palpatine, since Palpatine is the reason that Rey’s parents left her on Jakku in the first place.
Of course, that dialogue in the confrontation would still need to be trimmed to
“Weak…like your parents. Luke Skywalker was saved by his father…the only family you have here…is me.”