Trying to ‘break’ a hunger strike in a ball python is basically ignoring the will/desire of the animal. Why do ball pythons have to eat on a human derived schedule? What do you know about their current condition that they don’t?
Most colubrids aren’t picky about food, they just don’t naturally start on rodents. Again, it’s a factor or human convenience or desire. Alterna are known as being incredibly difficult to start, except when you feed them lizards. So is it a problem with the animal in that case or is it the method?