The Klemheist will clearly work, the thing I wouldn't care for is that is requires an extra few inches towards the tree. I like the idea of pinching the end of the bury with either something rubbery, or springy metal. But I just had another idea, perhaps a clothes pin would work. I'm planning a short Spring hike with my son, soon, I plan to try out several different things to see how they work.
"Every minute outside ... is a good minute!" -> Calvin & Hobbes, 8/1/1993