Welcome aboard. It sounds quite challenging, but likely worth it. It's possible just to remove Boga's sound in the mix without having to remove all the visuals. As for the other stuff, that is a huge challenge, but if it could be done ... woah!

It almost might be worth keeping Padme's funeral intact to put forth the notion that she faked her own death.

Edit: If you could grab the shot of her from Ep II on Naboo after Anakin's nightmare and superimpose that into Alderaan, you might have something huge.