That is the perfect way to get one to eat other. Its simply not what we are talking about.
What we are talking about is allowing snakes to BOND and form a pair or group. Once thats done, it takes extreme starving to cause them to eat eachother.
What you appear to not understand is BEHAVIOR. Animals that live in groups must bond and become part of that group. This can be done in many many ways. To not do that, makes any individual, NOT part of that group or pair.
What your really missing is this, only humans call animals a genus or species. Animals do not call eachother that. They only know who is us, and who is the others. If they are not one of us, they must be one of the others. And the others are fair game.
This is even pronounce in humans, Different people, kill eachother, different religions kill eachother, different races kill eachother, why? well you can make up all manner of reasons, but the base is, Those we kill are not us. They are the others.
Again, animals do not read books so they do not know kings from different areas are kings, they are simply the others.
Look at birds(very closely related) there are flocks that fight with other flocks. Hmmmmmmmm How do they know what flock they are from. There are birds that form huge flocks, small flocks, pairs and a few that may be solitary. This works with snakes as well.
Only snakes normally live in areas hidden from our view. So we rarely see them in groups. Of course with common snakes, we see it all the time. You know, like garders, waters, ringnecks, etc. But with fossorial snakes(kings) its normally hidden.
With varanids(monitors), the books call them highly solitary, But here, we do see many forms of this bonding. From what bluerosy says, pair them up and let them mate, to the males actually living their lifes with the female and helping in all stages of reproduction, including digging the nests. The quality of the bond determines the outcome.
Also we see monitors in groups with many females and several males and all get along and help with day to day activities. Again, they know what they are doing and we do not.
I do know, its all about how you allow them to bond. Sometimes, it takes nothing, but most of the time it takes being raised together.
The best way for kings is to be raised together. After that, it gets more and more chancy. Of course this is behavior and as such, its not a all or nothing proposition.
So with that said, I would not expect you, all or nothing, kind of people to have any understanding of this. Behavior DOES NOT FIT INTO tight pigeonholes. Cheers