If a district clerk is a party to an action in a court he serves, the district judge, on the application of any interested person or on the judge’s own motion, may appoint a clerk pro tempore for the purposes of the action. The clerk pro tempore must take an oath to faithfully and impartially perform the duties of the appointment and must give a bond, payable to the State of Texas, conditioned on the faithful performance of those duties, in an amount fixed and approved by the judge. The clerk pro tempore shall perform the duties of the district clerk relating to the action during the period of the appointment.