Have you ever tried using a BlackRapid camera strap? I use one all the time and find it the best solution. Has stoppers so you can position it back and around your side out of the way when not in use, then you unlock the stoppers when you want to slide it forward. Always stays on the strap and secured. (not a spokesmen)
http://www.blackrapid.com/products/sport
Great job on your successful climb by the way! Good stuff.