The Go Pro HD mount I adapted is a rigid mount that was made for an altimeter, such as an Altimaster II. A foam type altimeter mount would most likely flop around too much. I run the chest strap through the rigid mount and tilt the camera up at about a 45 degree angle. Any sturdy altimeter mount for your chest strap should work.
I have a GoPro HD camera mounted on my chest strap instead of my helmet. It's about as close to a start and forget it setup as you can get. The advantages are that easy to start/stop, better protection for the camera and a very low chance of catching a line during deployment. I have it pointed up at a 45 degree angle and the wide angle fish eye lens works pretty good. The disadvantages are that the wide angle fish eye lens does not catch everything. I have a couple of movies posted on YouTube at: http://www.youtube.com/user/1cyberone