I just uploaded a style for "HAND" that is an alphabetized Vancouver brackets - should show up within 30mins - why don't you give that a try and let me know if that works (and if not, what's wrong).
If HAND isn't right, please also have a look at Elsevier Vancouver, which isn't alphabetized, but might be what you're looking for otherwise - if it is, that's easy enough to fix.
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If HAND isn't right, please also have a look at Elsevier Vancouver, which isn't alphabetized, but might be what you're looking for otherwise - if it is, that's easy enough to fix.