I recently picked up a Hero 3 just in time for the season. I'm not a huge fan of the helmet mount view so I was looking into using a pole.
I came across this while searching in a GoPro forum.
"I use this awesome collapsible/telescoping pole constructed of corrosion resistant Stainless Steel, Brass and Poly-Carbonate components. It collapses down to under 9" and extends up to a maximum of 43". It is terminated on the rubber wrapped handle end with a solid brass base cap that has a 1/4" x 20 female thread in it and it is supplied with a removable wrist strap. The other end has a well designed adjustable tripod head section constructed of Poly-Carbonate and Stainless Steel featuring a standard 1/4" x20 Stainless Steel male thread tripod mount. It's great for Ocean, Water and Snow sports."
I really like this option because I hate riding with a backpack and this would fit in a pocket. I do not like the drilling. I feel like it would sacrifice the integrity of the mount and you would lose your GoPro.
I made a couple poles with some pvc pipe. Used the gopro tripod mount. I think it all cost less than $10. You can use a threaded pvc coupler to make extendable so I have two pieces that connect together if I want to go from a small handgrip pole to a 24 inch.