Welcome to Pherotalk Masu!
I loved your introduction. Especially the part where you said a new company emerged as bestseller with their instant this and instant that. Nothing is that instant but in terms of the amazing results and how quickly some of us get them it seems instant for real. 
The team gave you some great recommendations and advice and so here is my two cents on the matter. Ammo, shine , instant honesty and openness are great for the other settings you described.
However, for a classroom setting to seem more intelligent, that cool , smooth , dependable older guy that knows what he is about and still very approachable I will definitely go with Instant gentleman.
Here is an interesting thread I think you should read :
Your gc has been issued.