thumb - needs tiny tennis elbow band

My right thumb has tendinitis (for several months now) on the palmar side, from using the numeric keypad, specifically the "0" key hundreds of times a day. The thumb must move under the palm to reach the key. I have looked for a keypad with a different arrangement, but have not been successful. Besides icing in the evenings, I have taken diclofenac, which helped the lateral epicondylitis, but not the thumb, because I have no defensive tool, such as the arm band I wear for the elbow problem, which really helps give it a rest for healing.
Today I had a brainstorm. A similar band for the thumb! I used regular elastic, 3/8 inch wide, wrapped it around my thumb 1/8 inch above the knuckle, and took a few stitches to maintain the length. I have monitored the temp of the thumb tip to make sure it is not compromising circulation, and so far, so good. I have tested it with my usual actions that cause pain, and I think it is working. If I jerk my arm back with the thumb extended (just for a test), it still hurts, but less stressful movements, like pulling up sweatpants or opening a drawer have been much less painful than before. Is such an item available? I have not been able to find one. Note: I have experienced de Quervain's tendinitis on the same thumb, and I know the difference.