Don't forget that a lot of us have weights or other exercise setups at home now. I would definitely try something as an alternative to powdered chalk to keep my palms from getting slippery on my equipment. Especially now that summer is coming and I mostly train outside when I can.

Also, at least in Chicago, gyms have been open for months. They have reduced maximum capacity (I think it's 60% right now), but they were only closed for a short time. You may be severely artificially limiting your sales possibilities.