if two Canadians gave birth to a child in NYC, the child would be an American citizen as well as a Canadian citizen... but not a natural born citizen of either, as a choice is available
if this were allowed, then Kate and prince William could have flown to NYC, had their kid, and flown home with the distinct possibility of the future king of England also being eligible to be president of the US.
this is precisely the situation the founders wanted to avoid by using that exact term for that exact requirement
there is no two ways around it
Sure, if you prefer some other candidate, go for it -- but use valid arguments for why your guy is better.