Oh, I’d much rather have Andy Serkis’ awesome Snoke voice and for Luke to hold on until the trilogy’s end. But I just don’t know how possible either of those things would be with the existing footage. Having Luke & Leia help Rey defeat Palpatine is a really cool idea, though.
Regarding “Darth Ren” vs “Kylo Ren” – I do like the Kylo name, it just comes across to me as a random alias without being rooted in some sort of new dark-side faction or tradition that’s actually CONVEYED on-screen (which Snoke and the Knights of Ren seemed like they were going to be until TROS came along). Making him a straight-up Sith Lord is purely an exercise in simplifying what we did get…and for me personally, the ship has sailed on trying to keep ST edits roughly canonical.