The issue of the change of method of election or voting plan, or both, in any school district may be submitted to voters at any primary election or general election as defined in Kan. Stat. Ann. § 25-2502, and amendments thereto, or at a special election called for such purpose. If approved by voters, the new method of election and voting plan in the school district shall be followed in the election of members next following the change and shall continue in force until again changed in the manner provided in this act. Change of method of election or voting plan shall not shorten the term of any member serving on the board at the time the change is made, and the county election officer shall not submit to election any plan of change which violates this prohibition.