I like the glue-stick idea. Real stable in normal conditions and easily useable and decent adhesive qualities. What about a smallish "double injector" 5 minute epoxy tho?

The clothespin seems rather bulky to me for its usefulness. I carry a number of spring loaded things - Binder clips, safety pins, Spring tensioned key-cable and in my larger kit a fishing yo-yo. I think that I would see the use for a clothespin spring and improvise the wooden parts in the field.