I wouldn't take the MA or a PCT job for the reasons you cited. Mainly, once you are an RN that is your scope of practice, period, and you can't really "undo" it. I think it would be risky ethically, if not legally. It's a very good question, though, and one I haven't seen answered definitively.
From a different angle, I say don't give up on the nursing jobs just yet. There might be one just around the corner. Here's what I did when I couldn't find a job in my little backwoods corner of the world:
I got out the state/regional map and drew a circle out from my town as the center. The radius was about the distance I could cover in half a day. I figured this would get me to an interview and back in one day, with time to "look around" at the area. Then I went online to find every single hospital, nursing home, and clinic that existed within the area of my circle on the map. If a big town was just outside the circle, I extended it a little bit. It was surprising how many places I came up with. The American Hospital Association (I think it was AHA -- ) has listings of hospitals by state, and some are ranked by sizes and specialties, too. You can look up the towns and distances on Google maps or similar tools. There's so much info available online. Anyway, this kept me busy for quite awhile.
I ended up interviewing and taking a job in a neighboring state within my, as it turned out, 300 mile radius. Six hours drive to the interview, a couple hours to look around and get lost in town, then a six hour drive back home. I left my town at 6 a.m., the interview was at 2 p.m. and I was home by midnight. And I got the job! Now I'm job searching again, but that's another story.
Just some suggestions! Don't give up on your dream! Work hard and make it happen!