This sounds like a great plan. It's what I would have done in college if I knew what I know now.
As far as ATC goes, the FAA is still hiring off the street, and they look for people with aviation experience. Even if you don't major in ATC, you still have a good chance of becoming a controller assuming the FAA keeps putting out PUBNATs.
Isn't the washout rate at the academy amongst those coming off the street very high? I heard it was around 80-90%.