So I think a potentially really great Luke/Vader moment can be created in editing on the shuttle Tydirium as the crew is apporaching Endor. I thin ksome of the goofy lines in the scene really take away from the drama between Luke/Vader. I think a really cool idea would be to add in one of those really short “force dissolves” you see in Empire. But add that in between Luke & Vader.
I like that, you could use the deleted scene of Vader calling out to Luke, as Luke was building his lightsaber in the cave. You would need to use the shot of Luke in the shuttle, as if he heard Vader calling him, then cut back to Vader once more calling out to Luke.