A few years ago I was in a cold (somewhat drafty) office with poor heating options.
A space heater helped. Wearing a jacket and a beanie helped. But typing with gloves on wasn't in the cards.
So I looked around and saw ads for the Envavo Heat Buff, but I couldn't find a way to buy one.
I ended up looking towards heat lamps, what are used for repiles and so forth and found a combo that worked for my setup.
Finding something like this:
50W 2 Pack Ceramic Heat Lamp,Black Infrared Bulb Emitter Lamp for Pet Coop Heater Reptile Chicken Lizard Turtle Brooder Bulb Temperature
https://www.amazon.com/gp/product/B071GKDXBL
Plus some mini lamps:
Basic Desk Lamp
https://www.amazon.com/dp/B0CLDZJFH2
turned out to be the perfect solution for me.
It looks like heated keyboard mats is another solution that is commerically available, too. (I haven't tried them.)