Quite some time ago someone suggested their ideal intro (apologies for not remembering who) which went something along the lines of:
Luke finishing construction of his lightsaber near the dark side cave shown in ESB. Luke then walks into the cave and is again faced with Vader, but this time Luke deactivated his saber and Vader disappears as his lightsaber would connect with Luke.
The idea was to show Luke has grown not only by building his lightsaber but also by learning from his previous failure in the cave.
Now I always liked the idea of something like this being shown after Yoda’s death but before Luke leaves Dagobah but I can see justifications for either way round.
The reason I bring it up is firstly I think it would look really good - Luke building his lightsaber isn’t necessary but it could be a really cool scene that fits perfectly into the OT. But also to make the scene you’d need a body double, a good costume, and some good models/background paintings. And all that is before the actual filming necessities. But if someone went that far for the few shots of building the lightsaber then why not add a few more of Luke standing to enter the cave, deactivating the lightsaber, etc, as the majority of the parts needed would be the same, and most of it could be done without any clear shots of Luke’s face.
Just another thought to throw into the mix.