FBW, thanks for the research.
That's one answer, I guess. Possibly a good one: Certainly the simplest. You can argue that any half-way strategy runs the risk of complicating matters unnecessarily.
But if we do it that way, we'd better have a good answer to question #2: What happens when something goes wrong? Is LATCC backing up NERC? How do we switch to them? Who decides? How do we switch back again?
Short of that, what other responses to less-than-complete outages are available? Who decides?