TIL that outside the proscribed area there is no margin guaranteed at all.
In real life I reckon I would only ever circle to land if the weather was benign but for whatever reason ATC required a different IAP and circle to land. I can think of Palermo, Sicily a few years back when they were not allowing visual approaches across all of Italy and the navaids for 07/25 were being repaired. So we had to regularly fly an NPA for 02/20 and circle to land on 07 in CAVOK, slack winds.