Late response, so I suppose it won't get read, Just joined the forum. Thought I'd add this:
I've ridden year round on the west coast of Canada for 20 years (except when I'm in the UK), and by far the best way to keep your bare hands warm to the freezing point is to use both Hotgrips wired into your bike- 30watt draw I believe- same as the low beam anyway on my bike, and ATV Logic bar muffs, or what ever you call them where you are- I've heard elephant ears and others. The bars heat up, and excess heat warm the air trapped in the bar muff, so both sides of your hands stay warm. Of course, a large plexiglass windscreen works wonders for hands and the rest of the body.