Player stops keeping score & has more than 5 minutes left ?

It’s one less source of scorekeeping disputes (“my opponent’s not writnig and he has six minutes left”).

Also, the USCF was (regular) rating sudden death games before FIDE; I believe both the original USCF rule and the current one preceeded FIDE’s rule.

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So many clock-caused problems like this vaporize away if the time-control uses a larger time-increment per move, from move 1:

G/15 +30sec

There ought to be two rule books, one for all the clock issues, and the other for everything else.
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You will need more than two; i.e., the scholastic people have their own set of special rules. I seem to recall that Bill Hall had a similar idea (different rulebooks aimed at a specific nook) in one of my conversations with him. Perhaps your idea would make a good delegate’s motion?

Tim