I'm an ABSN student. GPA requirements depend on the college. My university had us list certain pre-reqs and calculated only the pre-req GPA. We were then ranked by pre-req GPAs and that was the only deciding factor on who got into the program. It matters not what your bachelor's degree is in, only that you have one.
I do not feel that I've missed out on a good education, in fact, I feel like I'm getting a better one because I go to school in the summers and will be done sooner and able to start working as an RN where the learning really begins. The less breaks I have, the less time my mind has to slack off. The traditional program at some schools takes 5 semesters! I cannot imagine taking 2.5 years to do what the accelerated program does in 15 months because, really, the main difference in my program is just summer school and I will gladly take summer school over an extra year and 3 months!
There are several options to finance your education, but I'd recommend looking into what's available in your area and I can't speak for that.