Theres a transition/conversion board that meets every year and selects approx 2 helo pilots to transition to jets, they also pick two helo guys to be C-130 guys. With only 2 guys getting selected a year, the selection rate isnt that great. I know a couple of guys who did get picked up though. You have to have a pretty strong package though. Alot of quals, hours, etc.
Squid- like I said, if you have a unique case that would dq you from jets, but youd still be ok for helos, they would probably work with you.