I was going to say a jungle carpet (I've not heard anything about them being difficult to tame).
A great alternative to an Eastern Indigo is a Mexican Black Kingsnake or a Black Milksnake.
Might also look into Pits (bullsnakes, gophersnakes, pinesnakes).
I'd also love a Cave Dwelling Ratsnake - they get pretty long.
Also, Honduran Milksnake...hmmmm...no boas....let's see.....burmese python?
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