We just ordered the stock throttle block, that way we able to keep the factory throttle safety switches and have a complete spare set of bars for spare.
I was trying to do the same thing. Leave everything but the brake, perc and throttle assembly on so that I could use the bars on another sled (or in case I don't like the RSI setup). However, you have to go to new throttle block and kill switch which can be touchy on the Pro. I had a buddy do that and had nothing but issues with his TPS. I'm not sure if it was a coincidence or not. The Pro throttle block will not come off unless the grip and heater comes off.
See above