I cannot answer the P.A. question except to say you don't take a nursing degree to become a P.A.
There are many universities these days that will offer a short BSN program to those who already have a bachelor's degree. If you want to be a CRNA, you need your BSN first. Then it is one year more after that to become a CRNA.
Remember if you are interested in the medical role, there is also a surgical first assist job, or OR tech that doesnt' require Nursing school. Nursing school is to train you to be a Nurse, not a poor man's doctor.