For a belt lanyard idea.

On someones web site (Possibly Ranger Rick's.) they suggested using springy coiled telephone connectors for belt lanyards for handguns and other items you don't want to become detached from your possession. Attaching a suitable clip for the use you have in mind should not be too difficult.

You can find them cheap in clearance bins, ham fests, and rummage sales.

Bountyhunter