I've just seen an advert from a well-known supplier of aviation materials for a face mask made by Tecnam. From the photo and the description, it seems to offer good visibility and protection both from another person's exhalations and yours on them. It could be argued that using such a device effectively extends the distance between people in a cockpit to the equivalent of standard social distancing, though the advert doesn't say this. The picture doesn't include someone wearing a headset. One of our members went flying wearing a surgical mask the other day, sounded quite muffled on the radio.
Using such a device in conjunction with what is effectively contact tracing that we've already worked out might reduce the risk to a very small (but not zero) level.
As Wannabedriver says, most instructors and examiners are regarded as 'vulnerable' by age but all the ones I know get quite shirty at the insinuation they're 'old', even though the youngest of the 5 we have is 61 and 3 are over 70 (eldest 78 and still going strong).
TOO