My particular RSI (over two decades typing on an actual typewriter in a totally non-ergonomic setup, whoo, plus elbows that overextend) means I have to be really careful about any kind of weightlifting exercise with my hands/arms/shoulders, even the ones designed for older women in Strong Women Stay Young with like a one-pound can of creamed corn or whatever. So actually something with resistance but no weight-bearing, specifically for hands, that sounds pretty cheap to make might be really helpful.

Your hand is afraid of the rice. The rice should be afraid of your hand sort of cracks me up, tho.