if there is to be a maul-grevious character, it would be awesome to have him feature as an actual character in the film, who gets toasted, so providing some form of humour later on when he returns even more robotic.
i also was pondering having Christopher Lee wear a mask throughout the film, and the name 'count dooku', is actually his alias for his true character (possibly making him sifo dias). he could remove the mask at the end of the film just before the duel.
on ep I integration - 'sifo-dias' could be mentioned somehow, maybe the jedi are going to naboo because his character never returned from negotiations. also maul would need to become a general, so lead troops and give orders.
we need men in suits with expensive equipment.
possible way of adding a mask -