Your ideas surprised me for the best. For me it’s always been hard to choose prequel edits because while they get rid of the cringe, most also trim scenes I genuinely like (Yoda using a lightsaber comes to mind) or try too hard to make them match the OT. Your intended edits to Empire and ROTJ are the exact same ones I had thought of making to Adywan’s Revisited edition and IlFanEditore’s color-corrected ROTJ. So far your changes list strikes a good balance for me, so I’m looking forward to see them finished!
Your Vader vs Obi-Wan idea is alright for me, if the rest of the movie is suitably improved to look more like the redone scene.