Legally Required: Is a class required for a CCW? If so, are there already classes available? What are your competitors charging? If CCW class is not required for licensing, how likely is it that poor folks will somehow find the money and decide that decide to spend it on a class?
Not Legally Required: It's difficult to provide the service you are thinking about if the class is not legally necessary and the people are poor. But it's not impossible. The man who raised me in San Soo retired and moved to a mountain community where there were already a couple of struggling martial art studios scattered about. After settling in he resumed teaching and soon had more students than he could accommodate. But he had no overhead, enjoyed the work, and taught for free. It might be that your class would be viable as a charity but not a business. Sometimes that's acceptable, depending.
In any event, Sean, I wish you good luck in this.