I am willing to let anyone born in the colonies before 1789 be an automatic natural born citizen. Are you with me?
You do not have to do that. Those who were alive in 1776 when the Declaration of Independence was proclaimed were naturalized by the Revolutionary War process and their man-made action to throw off them being subjects of the King of England and became the “original Citizens” of the United States. See the writings of David Ramsey in 1789 on that: https://www.scribd.com/lists/3301209/Papers-Discussing-Natural-Born-Citizen-Meaning-to-Constitutional-Standards They were covered by the grandfather clause in the presidential eligibility clause. These “original Citizens” then procreated the first “natural born Citizens”, the children of U.S. Citizen parents whose child in born in the country. See Vattel for more on that. See this report on the early Presidents and Commander-in-Chiefs: https://cdrkerchner.wordpress.com/2011/02/14/list-of-u-s-presidents-eligibility-under-article-ii-grandfather-clause-gfc-or-natural-born-citizen-nbc-clause-or-seated-due-to-election-fraud/