Hi risys82,
I know that your original post is a little dated. But for what it's worth...I felt obliged to respond to your situation since I can somewhat relate. I have over 10 years of experience in corporate management (incl. management consulting), as well as, an Exec MBA. I'm currently working on my 2nd masters in Accounting.
First of all, your GMAT & credentials are extremely impressive all around (including the professional designations). In addition, your education is coupled with great work experience and community service. I don't think I'm understating when I say that you're easily in the Top 15% when compared with other MBA candidates. IMO you stand a great chance at a Top 10 MBA program.
If you're currently in the Accounting Ph.D program, by all means, discontinue the program if you feel 100% that it's not something you wish to continue. It's not worth incurring the additional $30K+ per year just to prove that you earned a Ph.D when in fact the Ph.D may not be instrumental in landing you the ideal job. After I received my EMBA, I was hired by one of the Big4 as a management consultant. So I know for a fact that they place more value on the MBA degree than any Masters degree...in fact, an MBA is a requirement.
Having firsthand experience with Adcomm interviews with a Top 7 EMBA program and a Top 8 MS Accounting program, I can assure you that your predicament is not a showstopper in your application whatsoever. Adcomms know that every candidate has experienced some type of challenges, predicaments, etc at least once (i.e. change majors, change jobs, etc). Like the other posters said...Be able to articulate the reason behind your transition, and how you came to realize that an MBA is a better decision for you...but do NOT belabor this point to the Adcomms. Just move on to their next interview question. Your strengths will easily outshine this minor "divergence" (for a lack of a better word).
Anyways, my 2 cents...Good Luck!