In states where ASF are illegal, the laws are just about having the live animal; it isn't illegal to have them as frozen food items. And honestly I'd be pretty surprised if you had a similar reaction to them, as they are an entirely different genus and species from Norway rats...but I get that it's just not an easily accessible option. Your ball pythons are really lovely snakes, and I very much hope you can get something sorted out so that you can keep them.