Restoring a deleted scene: I can’t help you with that, even the most gifted editors here can’t do this. Most RotJ and Prequel Deleted scenes, though, are actually good enough quality that they’re usable.
Making Transitions Smooth: Really depends on a lot. What scenes? What’s happening? What’s smooth? How’s the transition happening?
Redoing music & sound effects, and removing music & sound: The Blu-Rays come with multiple tracks. If you’re using them, you can just mute one track for a certain part of the movie. If you’re using some other source (like Harmy, for example), I’d recommending just putting in Blu-Ray audio around the change in question.
Color correcting to the OT: I already know you know more about this than me