I think the clear bra is going to be the best option. I'm not speaking from experience on that though as I'm still trying to find out definitively if the clear bra itself leaves damaged paint when removed for fresh clear bra install every three years or so.
Reason I don't think mud flaps will work is the aerodynamic changes on the ZL1 have altered the wheel wells. There's plastic bits extending out from the wheel wells for air flow. That will both make the existing Camaro accessory mudflaps not fit and the mudflaps themselves will change the aerodynamics...