I quite like that, but I want there to be a hint of Sidious in there so it has some lead in to the other prequels. What if we only see Sidious when Maul talks to him on Naboo?
If I just remove the face from the Sidious Holograms and add a new voice, it should work well. Then it'll be a great moment when our shadowy antagonist pulls dowm his hood to reveal he's got badass horns on his head.
I like it. I like it a lot.