Checking Sprag

“, the stock drum can turn 15k rpm and at such rpm is a ticking time bomb”

The drum speed is normally much lower. About 1/2 engine speed when the sprag is functioning. If the sprag breaks or fails, the drum accelerated to 2-3 times engine speed. It explodes normally around 7-8k, or 3500-4K engine rpm.
Best defense is not a bolt in sprag, but the billet drum.