Haven't seen any others, no (there are a few home-made things out there, though).
Interestingly, it is an accessory I would never get. With decent gloves and the heated grips, my hands never get cold, even when riding in freezing temps. When riding in 40+F, I don't even use winter gloves. Of course, experience will vary with rider. But I will point out that I am pretty intolerant of temperature extremes.
It will depend on airflow. Gen2 has higher mirrors which is blocks more handlebar air.... BUT my bike counteracts that with the 2" risers, so go figure.