Something just occurred to me, Why not make something up that dirt bikers use where there is a hard plastic guard in front of the hands (to break the wind) like in this pic:
http://www.dirtbikemagazine.com/ME2/...25FBCCC928EF9E
After all it is the wind that causes the problem.
Probably available off the shelf at a dirt bike dealer;
http://www.dirtbikersden.com/shop/sh...ing+Handguards
http://www.dirtbikersden.com/shop/sh...cross+and+ATVs
Or you could make it from hard plastic and a bit of ingenuity.