I have the Comm PL rating and still fly the Osprey as a civilian. There is no path currently on the civilian side for gaining this rating, because there exists no aircraft to operate. About the only thing that comes close is being a production test pilot at the V-22 plant in Amarillo. I've been flying the Osprey nearly 10 years now, I'll be glad to answer questions you may have about tiltrotors if you have them.