Hey, I can't Email you because, well, I don't have an email that is up and running right now. But the only solution to your problem would be to make sure that it would be compatible as a game model, and use the camera as the character that can fly and is invisible. Then run it through the game engine, and see what you get. What I mean is like, you know in Unreal Tournament, for instance, when you are dead, you can fly and are invisible? Well upload that into the game engine... etc. Thats the only logical solution I can think of in which the scene is pre-rendered. The other would be to come up with a very advanced (or not, I don't really know, its not what I do) MEL script...??? Or maybe using an integrated graphics scripting engine...??? Like the one they use to make games that are not already made with a pre-created engine. And then make the character invisible, able to fly... etc. I don't think you can do this just in Maya woithout advanced MEL, and I think that you could do it a hell of a lot simpler with an outside scripting... programming... etc.
Good luck on acheiving this, and if you manage, tell me how to do it PLEASE!!!