Well, this doesnt answer your question directly but it might help. This summer I read a study of 154 people who got covid. 106 always wore a mask, 6 never, 6 mostly never, and the rest wore a mask mostly all the time. So out of 154 sicks, 12 were no maskers.

Also, there was a marine study. Strick quarantine for half, masks too I think, lockdowned, vs the other half who were free. Virtually no diff in # cases bwt the two groups but with slightly less sick in the nonquarantine group.