The ways things work now, the JD covers a few major doctrinal issues. These issues are also what is tested on the bar. I don't see any reason why those who dictate things now would go for any sort of limited license for just one area of law. Besides, the one area for this degree, business law, could still be affected by tort law, by constitutional law, etc.
If you want to study law but not for a JD, there are programs like this. If you want to sit for a bar but not get a JD, there are ways to do that, also.
Out of curiousity, when you say you have "MBA/CPA/CFA credentials", does that mean you've actually earned those degree/certifications, or are you talking getting what you would consider the equivalent.