I can't imagine that sort of thing being very popular.
I suspect that most people who participate in events like the TT2000 or the Grand Challenge have some idea about what they're getting themselves into, even the first timers. Presumably any event like that would have a riders' briefing in which fatigue is discussed. I.e. You get fatigued more quickly if you're cold or riding at 160km/h etc. You could check what the organiser has prepared for this.
Perhaps the entry form could have a short questionnaire along the lines of "What's the longest ride you've done in a day?" "When was it?" "How tired were you on a scale of 1-10?". Rather than this creating a criteria for entry (and lies) it would be to help the organiser identify riders that they might want to talk to personally to make sure they understand about fatigue.
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