? The rules for ERAs are rather clear and do not allow any such thing. Hunch is there what you have in mind is not ERAs by the definition but rather the required adequate aerodromes (max planning distance equivalent of 60 mins LRC as agreed with the CAA and put into OM part B). And for those, the rules are rather clear too. If someone wants to be more stringent and then not, it's all for the show, it's their choice.
Agreed it is not relevant to the thread.