Thanks for the suggestions. One thing I'm concerned about regarding helmets that aren't specifically bike certified is that skateboarding helmets are typically built to sustain less severe impacts than bike helmets. It is unclear if the same is true of snowboarding helmets.
I'm thinking I'm going to check out the
Giro Encore 2 if I can track one down in the right size. Not too expensive, somewhat ventilated, and certified for cycling.