“The choice of the President and Vice President is left up to 50 State Legislatures, acting independently of each other, using whatever methods they choose”
Not exactly if in order to “serve” one must meet certain parameters, such as age, citizenship,etc.
Correct. In order to serve, one must meet the requirements of the Constitution.
But you have not been talking about serving. You’ve been talking about “running for President”, which is not a concept with any Constitutional restrictions, except as provided by the laws of fifty states.