Jeff, assuming he is doing it through a machine shop, I don’t know if he has the facility to do it all himself. To that end I suppose he has a minimum order quantity to do it at a viable cost.
on my engines I’ve just moved the hub, put a little red loctite between the hub and the collet and between the collet and the crankshaft. Tightened them down PROPERLY and none have budged. If it does no real harm will be done to the engine but if it happens in flight, prepare to dead stick it in. Try it on the ground and see how it runs....
my mate got the universal sensor mount which has longer slots, tightened one side down and put locking cable around to the slot on the other side, it’s not going anywhere.