Sanitizer—absolutely! Especially during the winter season of flu, colds, and whatever that snotty kid in front of me has on his hands!
One time at Mass, a little boy was sitting in front of me constantly putting his hands to his face and his nose. I told myself I wasn’t going to shake hands with him and try to avoid his gesture if I could. Well, he put his hand out, and I didn’t have the heart to ignore him, so I grabbed his wrist and shook that. I think fist-bumping would be a good alternate.