I miss shooting my Co2's when it gets cold. They are very good shooters in warm weather conditions. I took the simple way out..

Bought a couple PCP's and a whole lot of springers.. he he he..
Some people are avid hunters and shooters, especially when they have shot firearms for years. Firearms are not effected by much..
I would tend to wear thermal gloves because of arthritis..

and just use a springer or PCP in the cold months.
But if there is a will there is a way to keep those C02 rifles working throughout the winter months. And the idea of a heated rifle sock sounds logical. As long as it is not to bulky.
Good Luck Wiener...

Gene