>>You'd probably have to delve into the old world sand boas, I imagine.>>

I browsed through several recent papers, and they all show that Exiliboa seems to be the next closest relative of the Charina bottae/Lichanura trivirgata species pair. It makes sense biogeographically and morphologically to have a Mexican species of dwarf boa being ancestral to Charina bottae, in which the dwarf morph is also the ancestral condition. The Calabar boa (transferred to Charina by Kluge) appears to be only convergently similar to Charina bottae.

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