Hey Ady, I know there was a lot of discussion a while back around using clever edits or AI audio to tweak certain Vader lines (changing “Obi-Wan once thought as you do” to “Your mother once thought as you do,” among other changes), but all of those attempts sounded a little unnatural to some degree. I just came across this voiceover artist whose Vader dubs are the best I’ve ever heard, he absolutely nails the OT-era JEJ voice.
https://www.youtube.com/watch?v=qmRRzpJDDv4
Here is his channel:
https://www.youtube.com/@RyanGoldenVO/videos
He openly offers his contact details for using his voice in production in his video descriptions, might be useful for any dialogue edits you’re trying to make in ANH or ROTJ Revisited.