John N,
I cannot locate anything in a search on the Internet either for you, but, I can offer something that you can do to create something that you may or may not like. With working with disabled vets, one gentleman came up with something very close to what you are looking for to put on lanyards for assisting disabled vets with tying their flies on tippet. It was constructed as follows: He took a spring loaded alligator clip and crimped it onto a short piece ( you determine the length you need) of coated single strand wire. On the opposite end of the coated wire he formed a small loop to which he attached a large swivel. He then used shrink tubing to cover the wire from where it was attached to the swivel down to where it was crimped into the end of the alligator clip. This worked very well and would be very easy for you to make up if you are unable to locate what you are looking for.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.