Yeah, like I said, once I put Kylo wandering through the snow at the beginning in, his line ideally won’t come in too soon. He hears a Sithy whisper, and this puts him on edge as he goes deeper.
A hypothetical first-time viewer wouldn’t know it at the time, but I chose “You are unworthy” because it is meant to refer to the idea that Rey is possibly the superior heir to the Sith throne, at least in Palpatine’s mind. I think it’s best to leave it vague so we can keep that.
The thing about the insecurity of Rey being a worthier Sith heir wouldn’t land with either Kylo Ren or the audience given that as far as he and we are concerned, at this point of the story the Emperor just wants to have her killed. The drama is that instead of doing that he’s planning on having her side with him. It is not revealed till later that Palpatine wants her as the heir. Therefore I think leaning into that at this point of the story is a bit premature.
On another note, there’s an old concept I brought up at the Ascendant thread but it wasn’t executed properly because I didn’t have a good enough Vader clone. Sounds like you have figured it out.
The idea was this:
https://drive.google.com/file/d/1gjKx7o3NC9aTZX1nDYD8ItbkJ6xn8BSp/view
Basically, it’s sort of a way to create a tenous link between the Wayfinder and Vader given that it’s his and it’s in his castle. Also reestablish who Kylo’s grandfather is before the Emperor brings him up and adds a little bit more of set up to the reveal of “I have been every voice you have ever heard of inside your head.”
As an added benefit for this particular edit, it would make their confrontation and Vader’s ‘killing’ more cathartic imo.