I think starting off with a lighting transaction between two people would be a great way to start. Maybe be their non-kyc exchange by exchanging $1 for the equivalent sats and zapping it to them.
Or heck, start by telling them anyone who downloads a wallet (WoS has been the easiest I've found to jump right into, plus they have funny randomly generated addresses) Will get 100 sats. And then give sats out throughtout the class for participating. Participating is V4V!