I’d prefer it would just get settled one way or another by SCOTU, but I think your proposed definition is practically unworkable. As an example I give you a riddle to solve for my son: born on U.S. to two citizen parents but still would not qualify as a natural born citizen under your standard, as he also qualified (and received) a foreign passport at birth. How?
I understand that you would like your son to be considered NBC but if he has a passport from another country then he falls outside what I understand the Framers to mean. Another country has a claim on his citizenship so his loyalty is divided. I don't think the Framers considered dual citizens per se but the principle that motivated them to insert the NBC Clause is easy to understand in this case - if more than one country can claim your allegiance then you are NOT NBC.