I know they say it's a waste of the last 3 years but in the long run that's not much in terms of your career/life. If you're really set on nursing then it's probably better to cut your losses and start now than follow a job you don't like for the next decade and wish you'd gotten into it sooner, which would be wasting far more than 3 years of your career. Plus things can change very quickly and the second degree funding could disappear, rendering you unable to change career in the future. If you're really set on nursing then you'd be wasting an opportunity to get into it for the sake of a career you don't like for many years just to get your money's worth.
I would advise getting some good work experience in the area of nursing you'd be interested in, so you can see what it's really like. I worked as a cleaner in a hospital for a bit and at least on wards they are massively understaffed and not able to do as much as they'd like for their patients because of it. Nursing is in demand right now because so many are leaving the profession for other jobs.