So we start with a blank sheet of paper, and on it we write:
'[INSERT NAME] is a football club playing in the English football pyramid, and, as such, can only participate in competitions sanctioned by the English Football Association, UEFA and FIFA.
'Any agreement or attempt to participate in a competition not recognised by these governing bodies will result in the club being placed under the control of an executive administrator appointed by the English Football Association, where it will remain until sold at a competitive market price.'
Football is still reacting to the bombshell European Super League saga from earlier this week
A proper contractual lawyer might want to tighten that up, but, pretty much, this should do it.