iOS15 focus doesn't allow me to turn off work email account after working hours

I know the US has weird concepts about working hours so maybe Apple corporate doesn't understand this, but when I finish work I just want my work email account to be turned off / disconnected / silenced / whatever.

iOS 15 on my MBP and iPhone lets me set my 'work' focus for 8.30-5.30 Mon-Fri, great.

But outside that time, there is no way to shut off just mail without purposely selecting to permit every app except mail. Furthermore, I can't switch off just the one work account in the mail app.

I tried to do this on my MBP as well, and I can setup mailbox rules but they don't allow me to filter by focus.

This is a much needed feature for Apple customers who are allowed to be 'off work' when work ends.

Does anyone have any workarounds in the meantime?