Just as in that other contentious issue, relegation, the rules already exist;
90. (1) The Controlling Body may by licence regulate any activity connected with the harness racing industry.
(2) An application for a licence shall be made by the persons in the manner and form and be accompanied by such documentation, information and fees as the Controlling Body may determine.
(3) A person applying to be relicensed with a Controlling Body shall, if previously licensed by another Controlling Body or recognised harness racing authority, provide a written clearance from that Controlling Body or recognised harness racing authority detailing the status of the person relating to current penalty, debt or other embargo.
(4) The Controlling Body may grant a licence for such period and upon such terms and conditions as it thinks fit.
(5)An application for a licence may be refused by the Controlling Body without assigning any reason.
(6) A licence may be suspended or cancelled:
(a) by the Controlling Body or the Stewards for breach of a term or condition of the licence, or
(b) by the Controlling Body where the Controlling Body is satisfied that the person holding the licence is not a fit and proper person to be associated with harness racing.
(7)The type, grade or class of a licence held by a person may be varied by the Controlling Body or by the Stewards.
(8) The terms or conditions attaching to a type, grade or class of licence may be varied by the Stewards or theControlling Body.
So it is just a matter of applying the rules and letting those that fall foul of them fight them in court if they so choose. I'm sure that most would baulk at the legal expense involved in that pursuit.