Are any of those rat snakes smaller in size?
Coxi are pretty tiny! they can be pretty defensive but they are amazing as far as color and can be kept in pairs!
green bush is more on the advanced end but is also small!
another awesome more red snake.
ratsnakefoundation has a lot of snakes that you can look through, coxi and the mandarin rat snake are my two top pics, just because they are rare-ish but small in size, fairly common to see captive bred when you find them and even though they might get a little "long" they tend to be very thin and tiny. Same thing for the rhino rat, thin bodied but VERY long which changes the cage requirements!