I don't think you will need to do any mods like "make the pot holes bigger", just get a pickguard meant for
direct mounted pickups. It's like the same pickguard found on the Jem77FP.
Make sure you get a right fit though. The guard itself might interfere with the trem.
Why don't you just to repair the damage instead of drilling holes in the guitar for a pickuguard?
Christopher.