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Anyways, my fix is to get the heart rate up. I jump on the treadmill at an incline and do some push-ups. 10 minutes is all I need. And no, I'm not a fitness freak.
Perhaps counter-intuitively, I have found that applying more layers to my core rather than to my fingers/hands tends to keep my fingers warmer. Of course, this only works if blood can circulate heat from your core to your extremities. Try throwing on a vest and, when coding, make sure your elbows are not bent and your writs are not resting on a pad in such a way as to obstruct blood flow. Good luck!
From what I've read, when the core gets colder, the body withdraws blood from the extremities.
I only experience cold fingers when the room temperature is below ~68°F. In a warm room I don't have such problems. I am young and get plenty of exercise, though.
I either go outside or go to the bathroom and wash my hands in hot water every hour or two for a reset.
In your circumstance, I'd look into USB-powered heated gloves as an option as well, e.g. [1]. If that alone isn't sufficient, some have removable heating elements that you could probably transfer over to the heavier fingerless gloves mentioned above.
[0] https://www.amazon.com/DPG230L-Technicians-Fingerless-Synthe...
[1] https://www.amazon.com/GoodBZ-Fingerless-Mittens-Computer-St...
I'm sure if you talk to your manager and explain that you have a legitimate medical concern that they will help reach a solution.