When teaching I wear a long hose and snorkel. It's really not hard to do both. Have a practice
EDIT:
For the record. Nimoh if you were assisting me as a DM on an OW course your snorkel would be on your mask at all times.
I understand that it can be done and done safely, just don't see the point of a snorkel.
Since I only divemaster for fun, and don't get paid, it wouldn't bother me much if you fired me