Any board may change the method of election or voting plan in its school district from that which it now or hereafter has to any combination of method of election and voting plan provided for by this act, unless prohibited by the conditions provided in this act. No such change shall be made unless and until approved by a majority of the electors of the school district voting on the question at an election conducted by the county election officer as provided in Kan. Stat. Ann. § 72-1087.