The Court can be helpful, but the states don’t need the Court’s permission to invoke the Tenth amendment.
Tell the EPA to shove it.
Bingo. Cite A1S8, 9th and 10th and tell ‘em to pound sand; kick all the ‘employees’ out of the State and continue on your day.
Course, the 1st step should be to stop any/all ‘payments’ to the Fed from the State, any biz and Citizen within the State for when the Fed attempts to drop the boot.