I think there's no perfect answer. I think the compromise would be to use them in corridors, and remove them in class. Never going to happen though. Corridors are where they finish their crisps walking to lessons after break, play fight with their mates when they can get away with it, and spend time showing each other memes etc. Teachers can't police every corridor, we're too busy running to the loo/ answering emails or grabbing a cuppa break time. So no enforcement there.
Lessons, no. They are hot and uncomfortable after half hour in the supermarket. 5 hours plus travel? I don't want to letalone the kids.
I will teach from the front, and ask the pupils to respect the space (I've just finished shielding). And do you know what, I think nearly all will comply. They are not stupid, and even the pupils intent on disruption will continue with mobile phones etc. rather than invade the space. Most kids are intrinsically nice, normal people, shock horror. Those few that aren't, some
will give in to peer pressure not to do it, or will be sanctioned in line with policy.
If they choose to wear masks, my classroom policy is clear regarding mickey taking etc.
I don't think forcing them to wear them is practical.