I read your post and I see what you're asking for. I don't have an answer, but I just want to point out that using "question and answer" human verification with a few simple questions (like you suggested) instead of using reCAPTCHA seems to be working for most people. I know on our site we use that and we get 5-10 spammer registrations a day (almost all putting links in their profile as opposed to posting spam), and I'm convinced that they're all humans. I came to that conclusion because I logged all responses to the questions for a few days and I saw no sign of random guessing or anything like that.
Anyway, just FYI.
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