The Windtech C clamp that rowjimmytour provided a link for above is the best option I think. For these components weight really isn't a concern. The reason the windtech clamp is the best option is that you'll then have a clamp that you can use for thousands of different uses, including using it for the purpose that you're talking about. You'll also be able to use the Windtech to clamp onto other people's stands or stuff you might find at the venue (leave your stand at home) or to put the clamp or your mics in different configurations that you might encounter. Once you have that clamp, you'll never look back because it will save the day in ways that right now you can't plan for.