devtrackers.gg
As someone who does have tendonitis from years of fencing (the stabby kind, not building :P) I have found compression gloves to help while I'm gaming to reduce the wrist strain I sometimes get. I got some off Amazon that are thin fingerless gloves that fit very snuggly and have rubber on the palms for better grip. Highly recommend!
And I also can sympathize with the cold finger issue. I do have a tiny desk heater next to my keyboard so I get some heat going across my fingers. Works wonders in a cold office or in the winter!