I have a sneaking suspicion why there was ever any such "map" invented .... IN THE FIRST PLACE ! Care to take a guess ?
And as your experience shows : MD'rs "knock themselves silly" when they find some minutia like this. Yet as your experience showed, you'd likely never run into anyone that cares one bit, nor knows anything about it.
For example : Even though it's very rare that any cities anywhere ever dream up "permits" for this, There's one very large city in CA that dreamed up a "permit" decades ago. And once this information got out in social media CA md'ing scene, md'rs in that area seek to get this "permit".
But humorously, no one can recall anyone ever getting "carded" for their permit in that city. And another time I heard of someone roaming city hall for an hour trying to find someone that even knew what they were talking about.
So you ask me : Do you really need that "permit" ? No. Same for places like you're discussing : You almost have to ask yourself : "Does anyone *really* care ?"
So My opinion is this : Just avoid obvious historic sensitive monuments. Presto, problem solved.