Another option? Take that list and have everyone contribute to a fund to buy them a license to make them legal going forward. No matter how long that list of "fav vendors/higglers/hustlers/friends" is now, it will grow astronomically fast until it will be twice the population in no time once it gets out someone is paying for it.
And.... it will also grow astronomically fast for exemptions until no one will have to pay for a license. Dang.