I've been charging my RAV4EV, my Model Ses and a 3 now for almost ten years, always on a 14-50 outlet, NEVER with a GFCI breaker. Not because it costs $100, but because I felt it was unnecessary. As my garage is dry all the time, I don't see the need. I use the supplied charge cable, and when going on vacation I unplug it. NEVER have I felt that my unplugging caused excessive wear on the outlet or the plug, and never have I found any cable warmth when charging. I did wire using 6-3 w/ground, but I also doubt that I used any specialty outlet. For such little use, I can't see the reasoning, other than some people just need to feel they've done all they can, beyond any basis in reality.
I suspect Plan C would do the job just as well as Plan B.