Natural Law (and a Natural-Law Giver) are a sine qua non of any ethical standard, NAP included. Otherwise what, "consensus"? Even Rousseau realized that was bunk.
If you think about it, Natural Rights are simply the flip side of the coin of Natural Law, and the Natural Law is basically the 2nd table of the 10 Commandments. It has been called the codification of conscience -- the law of God written on the hearts of men.
All that to say--agree with you.
(Followed!)