I dunno if this is a good idea or not, maybe not... but I wonder if there wouldn't be a way to add a small scene at the end before Vader dies... I wonder if its possible because we'd need someone who could do the voice of him.
After he's killed the Emperor and throws him down the chute...I wonder if we couldn't add a line "I have one more thing I must do."
We cut back to the battles and then we return to find vader sitting in his Black and white Ball thing. He turns to face the view screen, which could say something along the lines of "All sub-space channels Open."
To which he begins to speak a speech as we cut throughout the Galaxy.
"Your Empire has failed you. Your Emperor has oppressed you. But no more! The Emperor is dead. Your Empire is hereby dissolved and the Republic Senate is reinstated. The age of the Jedi will return."
Then we cut to the rebals flying into the death star, perhaps oblivious to it and destroy the Reactor. or they hear it on the speaker but its too late, they are going to finish the job.
This would seemingly build up a sort of...three step climax. First the death of the Emperor which is then bookended by the speech, then the destruction of the Death Star, and then the final Celebration at the end.
I think it would add a nice touch to the film. You could easily reuse old footage and it would only need someone to do the speech over it and the replacement of the view screen seen in Empire and some smart sourcing of shots from the other films to show everyone hearing it.
This would also explain how the entire Galaxy knew instantly tha thte Rebals had succeeded lol
