Oh my, Scarlet - You have painted such a wonderfully vivid picture and brought back lots of good memories from my Math Department days. . . thank you for the laughs!
I really think you should become the belt fairy -- leaving anonymous belts at their desks, all curled up, tied with a ribbon! (I was thinking from the 99-cents days at a thrift store. . .) But there is still a huge possibility that they wouldn't even 'get' the hint :-\
My son was in undergraduate Chemistry when he made the observation that it was a direct correlation between the professor's number of published papers and the food remnants in his beard. His other observation was the inverse correlation between the gnarly, mossy quality of their beard and their social abilities. (apparently he had all male professors
I do NOT want to offend anyone in the Chem/science academia field -- just tap into a persona that we have probably encountered!
That said, I adore the charm school idea, but, as always, they need to care first. . .