It is possible to change out racks on a mount, without the need for removable antlers. However, it depends on the supplies used during the initial mount. I wouldn’t suggest trying it with a mount done with epoxy. I also don’t like the idea of doing it with a mount that used DP instead of tanning, but that’s just my speculation, as I’ve never tried it. It’s certainly not a new idea, and I doubt you find anyone to do it for “cost:”