I'm in touch with Cyclevision via email and am really impressed with their design and thinking.

Anyway, for now I've moved one step further with my existing Sony action cam. I've obtained a tripod mount that fits nicely on to the camera body. It's a standard 1/4-inch tripod thread so I just need to find a helmet strap that can take a 1/4-inch tripod mount. This allows me to eliminate the bulky waterproof case that already had a 1/4-inch tripod mount on it.

Some blurry pictures: