Not an Osprey guy so all my info is second hand/comes from a very experienced-22 guy I worked with at Kirtland. His opinion was only rotating the prop and not the entire engine nacelle would be very beneficial. I believe there’s an ongoing mod program to fix the IR center body issues but could be wrong about that.
I always viewed the Osprey the in the same vein as the early helicopters or maybe some of the century series fighters, first of their kind, pushing the technical/engineering envelope, still figuring things out. My buddy referenced above said there were a lot of issues with the aircraft that only manifested themselves after the aircraft was in production/already in the fleet and the number of available spares for the parts that ended up commonly failing were low. Honestly hope that the industry takes all the lessons learned from the -22 program and incorporates them into the -280.