My two cents : My grandfather runs a small vending machine business. A few years back in France, snack vending machines were forbidden in schools in France. My GF replaced the snacks with fresh stuff (fruits, healthy juices, ...). The problem was not so much the feasability than the fact that students wouldn't be ready to pay for healthy stuff. He ended up removing the machines, relocating them to companies and putting the snacks back in.

IMHO the idea might be interesting, but you probably have to make it "cool" to buy your products, which means build a real identity around your stuff.