I don't breed boas, but it looks like Kahl T- and VPI T+ aren't compatible, so Kahl x VPI will yield all double hets.
Apparently another T+ is 'Paradigm' -- Sharp albino x BWC hypo (a rare case of codominance). Since Kahl and Sharp aren't compatible, breeding a visual Paradigm to a visual Kahl would yield 50% het Kahl het Sharp and 50% het Kahl het BWC.
This is all based on info from boamorph and the morphpedia. Someone knows this stuff off the top of their head, I'm sure. Some people can even keep track of ball python morphs, I've heard, so anything is possible.
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