Congress has already decided that a dual citizen at birth can also be a natural born citizen. It also declared in S.Res 511 for McCain, that the words "shall be considered as" are words of definition rather than words of pretend (legal fiction).
I doubt that the recounts will get to the point of states failing to send electoral ballots to Congress, but if that does become the case, the only thing controlling is the whim of Congress. The US is still a banana republic.
There are about 37 million heavily armed Trumps supporters who might disagree with Congress.