Absolutely, yes the CPA/MBA combo will definitely be marketable. Given your location and interest in all things technical, I could see a route through the finance group of a high tech company.
The CFO and finance managers within high tech are much more involved in the operations of the company, especially smaller ones, due to the M&A possibilities. I was able to make the jump when I joined a software firm as a business unit controller, but through the everyday interaction with the guys running the business, I was able to play that into a product operations role.
Yes, the Big 4 firm approach is grueling, however, I will say that it's a great training ground and does prepare you for corporate warfare later. But similar to you, I got fed up with footing numbers until my eyes were red when it really didn't matter in the end anyway! I have always said that a corporate audit comes down to a handshake between the CFO and audit partner in the end to see what the audit firm can live with, think of the audit fee as an insurance policy.
Oh well, if nothing else pans out, I see a career in aquarium setup and maintenance for you!