I love Maul's tone poem. I couldn't find a good place to use it though... in TPM that is. However, since Maul returns as General Grievous in my edits I fully intend to use the tone poem in Episode III. And the best part is no lip synch required!
The choppiness of that experiment stems from 2 factors. The first is the limited amount of angles to work with in that scene, the second is trying to find decent matches for Qui Gon's dialogue. I don't want him visibly talking during quiet sections, nor do I want Anakin to appear to be talking at all. The other problem is the render, there are a number of flash frames that aren't present when working in Vegas that appear when the section is rendered out. Unfortunately, every closeup of Anakin includes his background.
That's an excellent idea about the Liam dialogue from Batman, I'll have to go back and rewatch it, see what I can use.