(1) Within the counties of Genesee, Ingham, Kent, Macomb, Oakland, Washtenaw, and Wayne, a majority of all of the circuit and probate judges, subject to approval by the supreme court and to the limitations contained in sections 410, 841, and 8304, shall adopt 1 or more plans of concurrent jurisdiction under this section unless a plan of concurrent jurisdiction has been adopted under section 407 or 408, or unless a majority of all of the circuit and probate judges in that county vote not to have a plan of concurrent jurisdiction. If a majority of all of the circuit and probate judges in that county vote not to have a plan of concurrent jurisdiction, the chief judge of the circuit court shall report the results of that vote to the state court administrator.

    (2) A plan of concurrent jurisdiction under this section may provide for 1 or more of the following:

    (a) The circuit court and 1 or more circuit judges may exercise the power and jurisdiction of the probate court.

    (b) The probate court and 1 or more probate judges may exercise the power and jurisdiction of the circuit court.

    (3) A plan of concurrent jurisdiction under this section shall provide for the transfer or assignment of cases between the trial courts affected by the plan and to individual judges of those courts as necessary to implement the plan and to fairly distribute the workload among those judges.

    (4) A plan of concurrent jurisdiction under this section may include agreements as to other matters involving the operation of the trial courts participating in the plan, as approved by the supreme court.

    (5) A plan of concurrent jurisdiction becomes effective upon the approval of the plan by the supreme court.