I don’t know why he should act surprised either way, though. He knows his father was scarred and damaged to the point he required a walking iron lung to survive.

As for the feasibility of your scene, it seems pretty much impossible to implement in any way that would blend with surrounding footage at all. Plus a lot of it is told through prose and not dialogue or blocking, a lot of internal struggles and such - a big rule in screenwriting is only write what the audience will be able to see and hear, anything else is superfluous.

If you’re suggesting to move the Vader/Luke Endor scene to the meditation chamber on the Executor and this is kind of a long-winded way to get that point across, then that’s a more reasonable suggestion. But I still see it as too much work to pull off for something that will end up less effective than what we already have.