When plugging and unplugging the EVSE it is safest to first turn off the power to the receptacle at the service panel. (It states this in the installation guide of both EVSEs fitted with a NEMA 14-50 power plug that I have owned.) There is a risk of getting shocked while plugging and unplugging the EVSE. That is why the latest version of the NEC dated 2017 specifies GFCI protection for a 14-50 receptacle used for charging an EV. Note: The EVSE already has a built in GCFI to protect the user when plugging in the charging cord. Not all locations, jurisdictions have yet adopted the 2017 version of the NEC.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.