I agree that most of what I know of the UK constitution I’ve learned right here. And it amounts to precious little of the whole.
My original rebuttal was to folks upthread who seemed to be arguing that Charles would choose of his own volition to pass up being King in favor of the next generation. I was arguing the opposite; his volition would not run that way. Which is a different and largely unrelated question from whether the option to abdicate even exists as a matter of written or unwritten law.
I agree that the whole conversation about abdication has a decided air of fantasy or alt history about it precisely because (AIUI) that option is not provided for in the written laws, nor (much) in the recorded history.
With all that I’m not sure I follow your points. Not that I disagree with them; they were just a little too oblique for uber-literalist me to follow. Come again?

