I'm a bitcoiner and was going to use my NFC (private) as a cold storage wallet, so security is paramount.
And offtopic, there are already pubs that take cryptocurrency as payment. The Blue Anchor in Oxford takes Feathercoin (the feathercoin developers are from Oxford).
I was talking to them about it as I've been given the go ahead for accepting cryptocurrencies in the Student Shop I'm currently setting up (I'm a mature student studying architecture in Oxford).
I was looking at using my NFC ring (public) for payments in the shop (looking at using a Nexus 7 for the payment system).
If the students have NFC rings/devices then it's certainly easier from my point of view...