"Hardly likely to happen..."
I know someone who was up for prizes in English and Scottish champs last year, having completed the latter without setting out to at start of the year (key factor: two races doubled-up as British champs).
The Scottish "blazers" (none of whom I've seen in blazers - many are active runners) after, I believe, confirming he'd pick up the English medal, omitted him from their final champs results, in accordance with the rules. All very fair & reasonable, no hurt feelings etc.

Moral seems to be run more than one national champs, if that's what you want to do - but don't get yourself into the medal positions. Not difficult to do in my case.