You've convinced me. I'm going to try to fit a pair of sporran hangers to my kilt belt and forgo the sporran belt altogether. That way, a thief would have to cut 3" of leather, which would take a bit of hacking.

For recreational activities in Mexican border towns, suitable equipment might include a small can of bear spray, if it's legal there--that would leave a lasting impression on a would-be sporran-theif!