Thanks for your posting -- and congratulations on your interesting career.
Let me cut right to the chase, your grades (although long ago) will not cut it at HBS -- simply put, it looks for the world's best on every front and your grades are going to impact your chances. Stanford and Wharton are much more forgiving on this front so I would focus on these two schools to start off with. Also, HBS is not a fan of older candidates and you are approaching the stage where some schools will start to sway you towards their EMBA programs. I would say that this is the last year that you should consider applying to a traditional MBA program.
In addition to H/S/W - I would also recommend that you look at a few other schools -- all top programs - but ones that are more open minded in their admissions perspectives - including Sloan, Tuck and Booth. These schools all have great resources and your peer group will be just as strong as it is at H/S/W.
Lastly, if you want to transition your career back to the United States, I would really recommend that you attend school full time. An Asian domiciled program or an EMBA is going to keep you pigeon holed geographically.
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