I'm looking at ideas now since I changed my bumper and tire carrier. I've seen one that mounts where yours is and has a hole for a padlock. You might be able to do that. Can't tell from your picture. Looks good though.
97 TJ Sport, 4.0, AX-15, 4" lift, Rancho 5000's, Pro Comp ES2000 Stabilizer, JKS discos, T-Case drop, Rampage top, Sony/Sirius deck, 33" Firestone Destination MT's