The preamble does not enumerate any powers.
If the Constitution created a national government of limited, enumerated powers, and left all other powers reserved to the states, then it’s either explicitly enumerated among the powers of the national government, or it still belongs to the states.
I don’t see any way talking ourselves out of that is going to end well.
Explain to me how something that is in opposition to that very mission or purpose explicitly outlined in the preamble could be considered anything but, "unconstitutional."