I have a proposal: it could be possible add using a dub voice or a vocal sintetizer which imitate Palpatine’s voice to explain better the relationship between Palpatine and Rey and the way which Palpatine comes back? I think that these importants passages can’t be explained in extra media like novel or comics. The movie had to be standalone in my opinion, and not explained using “DLC” like a videogame.
I’ve only heard four acceptable impersonators. One, Ian Abercrombie, has sadly since passed away. The others, Sam Witwer, Tim Curry, and Nick Jameson, are all out of the budget I imagine 😅