Probably a bit late to suggest this but has it been considered to add in this video?

https://www.youtube.com/watch?v=owrmLeX20CY

I’m thinking 1:50-6:23 (abruptly cut at the end) would work well as the vision Kylo experiences when he meditates on Vader’s helmet.

-It shows how Kylo struggles with living up to Vader’s legacy (especially with Vader demeaning his as Ben)
-Essentially adds in the Vader/Kylo duel from the DOTF script/concept art
-Could be seen as continuity in him rebuilding his mask? He sees himself in this vision defeating Vader so that could represent him overcoming his internal struggle with Vader’s legacy and then rebuilding his mask because of it
-Overall just a really cool scene

I know Kylo’s vision in this scene has already been edited (in a way I also like 😃 ) but I think this is a really cool alternative that I might put it on my own