I was reading somewhere that you CAN powder coat carbon fiber, and that larger industrial coating companies do it regularly. It involved a person actually being IN the oven. I believe that its a lower temperature, and they spray the piece once its warm enough, and the powder actually cooks as its flying through the air. Its sounds a little wishy washy to me, because I thought the piece had to be grounded, or negatively charged. I'm not sure which.
I could be completely wrong too, I just thought I'd throw it out there. Besides, that would probably cost BIG bucks.