“Plus the fact that executive orders apply only to people under the jurisdiction of the executive branch of government.”
He can have ATF change the 4473 form without even an EO. Suppose he makes a new box saying “attach psychological evaluation from a certified psychiatrist here”? Not something you can refuse or disobey.
Paper covers rock, scissors cut paper.
How long do you think it would take to fast-track that to the SCOTUS? Not very long.
What I wrote is still correct. The executive order has to be followed by the ATF person, who is under the jurisdiction of the executive branch. The resultant action may affect you, but the executive order is not something that YOU are required to follow.