It would be interesting to see who the first teachers are to do this and if the media picks them up. I know small media outlets would as they pretty much cover anything.
POS Wallets could teach a lot about basic math even to elementary school kids. PiggyCoin in fact seems geared in that direction, it's like a Piggybank.
Well, that's a good idea. I would even do that in my class later (I'm a Mathematics teacher, anyways). Actually, Mathematics is a very interesting subject, and integrating it with cryptocurrency will be a great way to make it more interesting. Cryptocurrency will fit best in topics like Algebra, Probability, and Statistics where students could learn how to predict the price of a crypto with the given data. We can also use that in other subjects like Economics.
Economics truly suits the idea of crypto. When this will be added to your topic, especially trading, I think some of your students will be inspired to do trading, may it be crypto or stocks. As a teacher, you have a great influence to your students, and you can use that influence to make the community grow.