If a proficiency test is truly coming for model aircraft (I highly doubt it is), the smart move would be for the AMA to go ahead and establish one. That way it's made by modelers for modelers, and will be something we can live with. A simple checklist sent to every club to be used by AMA instructors would get it done.
This recalls a conversation I had with our lead instructor a few years ago. I told him every new pilot should be taught the maneuvers in the SPA novice sequence before solo'ing. If you can do the whole sequence without any zero scores, you are ready to fly on your own. Those include straight flights down the runway, a fast roll, a loop, a Cuban 8, and takeoff and landing. If you can do all of that without crossing the safety line or losing orientation and needing the plane saved by an instructor, you are good enough to go on your own. The lead instructor only felt that right and left turns along with takeoffs and landings were needed.