I think the RN route is best for people that want to go the CRC -> CRA route and is unnecessary for the type of research you want to do. CRCs need this background becuase many are actually providing healthcare, doing blood draws and educating patients about the investigational products they are taking. You won't interact with patients. I think all you would need is documented education on medical terminology to get into the research that is more epidemiological in nature, with past cases or evaluating hospital policies, etc. that interests you.
I would suggest doing a nationwide search in academic medical centers.