If you want to try mixed communities, especially in the confined space of an enclosure, despite theorising that "it seems plausible on paper" as you also did with the snake/turtle thread, you'll find that snakes will not be suitable as members of a mixed herp community, even if the other occupants are also snakes (except perhaps if they are the same species and of similar size, and even this is a risk). I actually don't even see how this latest thought bubble seems "plausible on paper," both species mainly feed on cold-blooded prey, which probably includes any reptiles they can catch. What sort of paper are you using?