“So what logic would the Framers have used to argue that persons with fundamentally divided loyalty should have equal access to the presidency? Has a court specifically offered an opinion on what have motivated the Framers to invite the children of foreigners to occupy the office of POTUS? “
Yes. It was discussed at length in WKA. Half of the decision involved that question.
It was a question. I.e.: why would the Framers have preferred divided loyalty over undivided loyalty? If it was discussed in the decision, on what basis was it concluded the Framers would have preferred divided loyalty?