Not so sure on that, I really don't think you can do what Amon Tobin did on his album ISAM with a vocoder...no offense but if it was that simple he would have done it. I will link a video or two so you guys understand exactly what I'm referring to. In my experience vocoders are just not capable of transforming sound the way I hear it in my head, it sounds weird and to kraftwork-esque (totally not dissing them btw) and just doesn't really get that transformation I'm talking about. Watch the video at any rate.
Making of ISAM Sounds - YouTube