Let’s talk about Palpatine’s plan (and how Kylo interacts with it), so I’ve got it completely clear long before we get up to Palpatine explaining it.
In this version:
- Rey is no longer Palpatine’s granddaughter, and
- Palpatine no longer cloned Snoke from a vat.
I also want him to know about the Force Dyad from the start, and have it be his ultimate plan all along. I find it accidentally comical otherwise in the original - he’s spent decades meticulously planning everything, then right before the climax of the movie he’s like “oh, wait, this other thing randomly popped up, that’s much better.”
The other issue I have is that Palpatine tells Kylo he wants Rey dead. That doesn’t make sense in this version, or the original - in the original, he wanted Rey to become the new Sith Empress, or at least he wanted to take over her body with Spirit Transfer, which he can’t do if Kylo has killed her. My plan for that is, Palpatine makes it clear he wants Kylo to bring Rey before him and then kill her in front of him (which in this version, of course, is a lie).
So, unless I’m forgetting something:
- Palpatine dies on the Death Star II. He wakes up on Exegol, where the Sith Eternal cult start constructing the huge fleet of Star Destroyers. Palpatine waits in the shadows, watching events unfold, waiting for his time to strike. The First Order rises, Snoke comes to power, Rey and Kylo develop their Dyad connection, Snoke is killed, and the giant fleet is finished. What good timing!
- Palpatine wants to get Rey and Kylo in the same room with him, so he can drain their Force Dyad and bring himself back to Ultimate Power™.
- To do this, he lies to Kylo, telling him he’ll give him the giant fleet and make him the new Emperor, as long as Kylo brings Rey to Exegol and kills her in front of him.
- Kylo, meanwhile, plans to turn Rey to the Dark Side, then bring her before Palpatine where they’ll kill him together, becoming Emperor and Empress without Palpatine.
- Kylo doesn’t know Palpatine’s true plan, and he thinks Palpatine doesn’t know about the Force Dyad.
That way, when Palpatine waffles on to Rey when she arrives at Exegol, he’s actually just stalling time until Kylo gets there as well. It also means Kylo thinks he has a secret advantage over Palpatine - the Dyad - when he actually doesn’t, which I think is more interesting.
It also means Rey is trying to get to Exegol under her own steam, thinking Kylo is trying to stop her getting to Exegol, when in fact Kylo wants her to get to Exegol - but with him, oh his own terms. I think this also makes the story more interesting - they want the same thing, but they want it in incompatible ways, which highlight their desires and motivations.