Yup! 17,000rpm is not a lot of piston speed. The only thing that will wear out a motor prematurely with a tuned pipe is setting the needle too lean.

Not sure I'd trust any prop that went completely supersonic anywhere along the blade. The shock waves can be very violent. Aircraft wings will twist up (control reversal) if they aren't designed for supersonic flight and the airplane exceeds Mach 1. I'm not sure there any props designed to operate in that realm. Besides, what engine could spin a 10 inch prop 30,000rpm? You would probably need about 15hp