Give people a couple of BTC or so for free and have them sign up with their services. Then by contract they would have to provide said services in exchange of BTC.
The exchange would take ~10% of payments to cover risks (no service provided), if no losses occur this is simply given as new loans.
Services would be made to cost less than the average paycheck to bring back the capital through the exchange.
People would still sign up because A they get free credit and B they may not have a job so the "average paycheck" means little to them.
Not a bad way to create activity in your community if no one is working and no one has cash. Even if all you do is shine up your houses that could create real jobs/sales down the road.