You need the degree to even apply to be a pilot in the Guard/Reserves. You said you couldn't afford both so I think people are assuming you can pay for school and then apply to a UPT board.
If you are looking to enlist into a non-pilot job to pay for school, then try to go for a pilot slot that is a possible path too, however much longer and equally competitive. The Post 9/11 GI Bill will pay for your flight training costs at a civilian school after you get your Private License, along with your 4-year degree, it's not "the Guard" paying for it.