Yeah, I was considering that. The thing is I want to stay true to Lucas’s idea that Sith can’t become full Force ghosts, which makes for elegant irony. That said, TCW showed us the ghost of Darth Bane, proving that Sith can be become ghosts to an extent, they are simply bound to an object.

Also, Palpatine being a spirit would nicely mirror Yoda being a ghost, as I tend to view them as counterparts.

So yeah, I might go through with having Palpatine possess Snoke, but definitely not Kylo. That reminds me I saw a video once that proposed Snoke coming back in IX and being defeated for good by the combined power of all the Force ghosts. That’d be a cool way to end the saga, I think.