Not very, but there’s no need to do even that when the microstamp isn’t registered to you but to the person you stole it from. Or more likely, isn’t registered at all because it was originally stolen in another state without this requirement.
Being more creative, how hard would it be to pick up microstamped brass at a public range and drop it at the crime scene?
You hit the salient point in all of this. For this scheme to work (solve crimes) the govt. has to know who actually owns the gun. That requires registration does it not? Camel’s nose under the tent.