Nick (Night_Rider) has a heated grips on his bike. Maybe he will chime and help with the question, or try to PM him to see if you can wake him up!!
Meanwhile the idea is VERY appealing to me so I find this thread more than interesting. My Trophy has heated grip and all I can say is OMG!! The heated glove idea is intriguing too to say the least.
I'm also considering the use of heat packs to warm the ol' hands. There are all kinds of them on the market but
these guys have some that are reusable. Just a thought.