That’s part of why I think the Vader “calling to Luke” thing from the lightsaber building scene is necessary for this to work.
While Ady has said that no deleted scenes will be included because of poor quality, I feel that this scene has the greatest potential for reshooting with body doubles and some conscious changes (i.e. not showing Luke’s face). I don’t know if that holds any appeal for him, but I think that’s it’s at least possible, and I really like how it connects two disparate parts of the film. It also plays really nicely with the revised crawl that I just proposed in that Vader is desperate to find Luke.