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This gizmo is so light, it would only need a small piece of velcro to stick it to something. Also, it would be easy to drill a hole for a lanyard of some type. I say leave it as is, inexpensive and simple, and let user make their own mods if needed.
If you decide to make a metal version, I'd suggest experimenting with the shape of the slot - there might be a way to make it double as a bottle opener.