The truth is, no. Not really. Although it would be ideal, the hologram flickering in is not possible, because I would need a clean version of the exact same background without the hologram. And even if I had that it would still be tricky to accomplish. We'll just have to assume that we come in during the middle of their conversation.

The lips moving is a definite no. BUT, we could add Greivous' dialogue when you're looking at Nute and only seeing the hood. I wish we could do more, but we've got to work with what we've got.

Unless, of course, there's some special effects genius out there reading this who wants to do it for us.

I didn't think this scene was possible to salvage at all until MTHaslett suggested editing it this way.

EDIT: They did a nice job on that Vader clip you posted. That's the best version of that scene that I've come across, and very close to what I want to accomplish.