I disinfect pens already and try to position myself at a little distance if I have obviously sick signers. I've never caught any virus at a signing, yet.
I take colostrum capsules every day which has been extremely effective in increasing my immunity to colds, etc. I used to get terrible colds every winter, which would last for weeks, but since going on colostrum 17 years ago have only had 2 colds and they were very mild 3-4 day colds. My husband and I both caught Dengue Fever on a trip to India a few years ago. He was very sick and I had a very gentle case. My doctor said that I wasn't sick enough to have Dengue but a blood test confirmed it - I credit the colostrum for protecting me. I hope that a strong immune system would be helpful if ever exposed to Covid-19.
I expect that there might be a time to wear a mask, as a precaution to neither spread or contract. They say that masks don't keep you safe, but I still think they provide a degree of safety or they wouldn't be used so extensively by the medical community. I bought some years ago and plan to make some nicer looking ones. Hopefully, will never need them. When I fly, ever since the Ebola problems, I carry a few masks (and gloves), and still do just in case, if I'm near someone who is obviously sick, but usually opt to wear a long scarf that I can pull up over my face - a little more discreet. I've also never caught a virus while flying. My biggest risk is probably from kids/grand kids . Lowering risk is better than no precaution at all. I would still probably wait until my area has the virus but if/when it turns up here, I think the signers would appreciate precautions. Even common viruses are enough of a nuisance that I want to avoid them.