Avi K, thanks for the reference. The question is how to affect things lehathila. Maybe, Jewish communities instead of requiring vaccine passes, simply prepare a shtar to be signed, saying in case beis din determines me responsible I will take the practices listed above to the extent of my responsibility? That is, say, 1 of 3 people had infected 4th, then each should fast every 3rd week.
If we can figure two people holding one tales, we can figure out this.