I don't think it will be quite like that, quite like you imagine; the science/biology courses get in there the whole time. My stepsister dropped out of nursing school altogether with only one semester remaining (she already had a much older BA in a science subject so was in an accelerated course for an RN) because she couldn't do the science/biology stuff; my husband drilled her for her chemistry exam and she got a "B" but just couldn't stand that it wasn't "only nursing" like she imagined.

You might want to get to a nursing-related career and go to school while being fulfilled doing stuff such that the courses make more sense/are in context? My stepsister was an aide at an assisted living center (her oldest daughter is an RN) when she was going to school and her schooling did help taking care of my stepmother as she got older/more senile, etc., dealing with doctors.

If I wanted to be a nurse, I think I'd work my way up like that, get an Licensed degree and then my Registered one. I know my neighbor next door here was licensed and able to take her extra courses to be an RN on her own, self-study and then just pass a test; maybe something like that would work for you, where you study on your own?