For those going the Rey Palpatine route, what do you think of setting that up at the get go? I believe that’s the way it was intended in original script and it would spare us the tacked on reveal above kijimmi. When Kylo asks Palps “who is she”, he could reply with a cryptic “Our blood” or “One of Us” , which may or may not hint at palps creating
Anakin skywalker and would give more credibility to Rey Palpatine taking the skywalker name.

Edit: For the Rey nobody angle I think it’s important to expand upon the reason Palpatine wanted her on exagol, her significance to the overall story and most prudently the reason for her innate darkness. I think this should also be covered at the get go, here are a few options, although there are many ways to go about this:
“Who is she?”
-“a vergence, destined to be sith”
-“a wound in the force, destined to be sith”
-“an awakening in the force, unseen for generations, destined to rule.”