Hmm... yes needs a PrC. How about something like a dodger/divhead PrC that advances sneak attack a little, divhead class features/spellcasting a little, and gives a few stage I Mechanosynth evolves? Hell, I can even call it the Agent. Thoughts?
In other news, I added two more Dodger feats, and the first set of regional feats. There will be more, so if you don't see one you like that fits then don't worry. You get a regional feat for free.