Thank you for your responses.
pike - I think I will follow a similar approach. However, I think it's tricky from a psychological perspective, because any thoughts of having a nice plan B in case the MBA ap fails give you comfort and an incentive to "half-ass" something very time and effort intensive.
Izvos - Agree about the network part, even though you can't really quantify it; I'd be interested to hear some "case studies" on how MBAs benefit from the network. On this forum, there are numerous posts how 5 years out whether and where you did an MBA would barely matter. Everyone seems to be focused on job placement, which I guess makes sense as many people on here are career changers. However, I'm not. Point taken re the flexibility of picking an alternative career. As a foreigner I feel slightly limited there - not going back to IB, and outside of IB and MC the visa sponsorship situation gets tricky. Also, my company hires from Top15 schools - while all MBAs are very capable, there surely isn't a wow element (which might be the case at MBB, but then again, if you have the pedigree to work at MBB, chances are you were very capable prior to the MBA). It's almost like the MBA was that final quality check stamp they all got prior to being employed and sent to clients. Finally, I have a very international background/work experience and will also be taking on a project outside the US very soon.
cheetarah1980 - Good point. An MBA is not explicitly required to progress in my firm. That is definitely a requirement at MBB, for example. However, that being said, I think I am done with the 100-110 hour weeks, i.e. I have little motivation to chase MBB after MBA. I value my health and a (kind of) balanced work life. If I was focused on money and prestige at the expense of everything I probably would have stayed in banking. Also, I have an MS Finance from a reputable school so I have some credibility when it comes to analytical and technical ability. Of course, I have the credibility of an undergrad when it comes to facing clients, driving meetings and maintaining relationships with them. I could be a more polished "salesman" for sure. And as you progress, my guess is that salesman/soft skills weight exponentially more.
Best - zenith