I would however, consider you taking this into an SMT realm. Meaning, that you could see if you could apply this whole concept, a system for education compensation for both students and teachers with a Token.
We have been thinking about the advantages of SMT and I think that having a token for promo-mentors could increase the student and teacher interaction a lot. The reason that we do not choose for ERC20 for now is because it can add a lot of complications to the interaction, because ERC20 work differently and much slower than sending Steem.
We will however most likely implement SMTs when they are out. Unfortunately, this is several months away :).