The right side hole is the side plate screw,,so one would need a new screw fitted to take care of it and keep the plate in position properly.
That would be one giant sideplate screw!

The right side hole is the side plate screw,,so one would need a new screw fitted to take care of it and keep the plate in position properly.
The left side I'd clear the hole cleanly with an end mill and rivit a steel plug into place with a slight under cut. Properly done it would very difficult to see and wouldn't move or come out.
Though really, why not leave it like it is, and just shoot it?