The new trend in the Yeshiva community that seems to be emerging is the best and only way to deal with it: treat anti-vaxxers as second-class citizens.
There’s no point is trying to reason with them. The only language they will understand is social ostracism given that their whole belief system is based on being part of a cult of like-minded weirdos. When they see that the social harms of being part of the club outweigh the benefits, they will suddenly start believing in science. Then, the time will come for the rest of us to forgive and pretend to forget that those individuals used to be complete morons.