I take your points- better to avoid confusion with local species & their regulations, & I don't think they're easy to find "c/b" either- not many people are that into racers, for one thing. I can remember seeing a blue racer when I was a kid though, in the wild, & it was amazing! Not to mention, FAST.
That garter snake is amazing- too bad they're hard to come by too. Importing one from the Netherlands is probably not do-able either. I guess you've narrowed it down pretty well to the VBB- & there's nothing wrong with that choice anyway.