If the board of supervisors, at any time after making an order as provided by Section 74466 and prior to the election on the proposed redivision of the district, finds that it is in the public interest to do so, it may appoint not more than two electors of the district as temporary additional directors of the district. The number of temporary additional directors thus appointed shall be irrespective of the number of existing divisions of the district and of the number of proposed new divisions of the district. Such temporary additional directors shall have all of the powers, rights and privileges of elected directors and shall hold office until the election on the proposed redivision of the district.