I'm going to have to agree with the others that have said to pass on them if the fasting will be a problem. Balls can be extremely frustrating, especially when you have one that pounds everything you put in front of it for months, and then starts refusing food for no obvious reason. When i thaw rodents for the balls, I always thaw less rats than I have snakes, because I know there will be ones who refuse food. It can be extremely frustrating when you have a female that's on track to breed for you, and then stalls out somewhere between 700-1000 grams. If you are able to deal with the fasting (I know it makes me want to pull my hair out at times), then I'd say go for it.
If you want an idea of how long they can fast when they feel like it, my male pastel went over a year once without looking twice at any rat of any size, be it F/T, fresh killed, live, stunned, singing, dancing, wrapped in bacon, whatever. He's still here, he's still healthy, and he's my best breeder.