Buen Camino, Matt,
You are opening a bit of a sticky wicket. I think that beiramar has the right of it; unless you live in the EU you may run into some legal hurdles that prevent such an activity. On the other hand, if you were offered your services on a "donativo" basis - the pilgrims pay what they can for feel good about - then you may be able to slide by.
The Camino for many is a pilgrimage. Such an path is taken with a certain frame of mind that is often based upon serving others - assisting others where, how, and when one is able. Yet, there are many that walk the Camino that are there for an adventure in a foreign land and enjoy having additional services along the way. This tension between the two approaches is always there and will continue to be so. They each have a very definite impact on the ambiance of the Camino itself. I hope I am explaining this well enough for you to appreciate a different perspective that others may have of your objective and desires.
I expect that there will be some, if not many, that would really appreciate your service. I am sure we have some EU business people here, Ivar is one, that can give you their advice on such a proposal. Regardless of the answer you find, come and be welcome on Camino.
Cheers,
Michael