[Creeper]

A low cost, but no where near as attractive, alternative to "fill the holes" is with set screws, red Loc-tited in place. The screws can be installed from the inside out, ground flush and then reinstalled permanently.

An even cheesier method is to fill the holes with metalized epoxy and file flush. Slightly less cheesy, if the epoxy work is done very well, you could Cerakote the frame, and the holes would all but disappear.

Down side to any of this, if the screws or epoxy comes out, it could lock up and even damage the gun.

As Jim said, it is out of the custom shop, and probably worth not doing anything dumb without serious consideration.

C