That's a lot of words for what can be summarized in a short sentence: clockwise is clockwise because that's how a sundial moves in the Northern Hemisphere.
The Northern Hemisphere has twice as much land as the Southern. Today 88% of the World's population lives in the Northern hemisphere. The fact that we are North-biased is not a fluke, but an effect of geography.
So if it's all conjecture, and you wipe the conjectures away, you really do have "I think it's either because shadows in the Northern hemisphere go from left to right when you're facing North, or because when you track the Sun across the sky from that hemisphere, you have to face South and then the Sun describes an arc from left to right."