The typical hand-operated chamfer tool isn't piloted. I have read of folks chucking them up in a drill press and using them powered. One user rigged some sort of PVC pipe guard for the "horns" on the outside chamfer end of the tool, to protect his fingers. But you can just use the hand tool unpowered. You are only removing a trace of brass - just a couple of twists.
I have very little experience with lead bullets, but I understand the following to be true -
1. Used at higher velocities (1200 fps + ?)
2. Can't be added to bullets not designed for a gas check
So, more than likely, your 9mm loads aren't hot enough to neeed them, and I can see from the picture of the bullets you ordered that they have no shoulder to receive a gas check.
.30-06 Springfield: 100 yrs + and still going strong