An elected or appointed Macon County official not currently serving as such an official who is elected or appointed after the effective date of this amendment may not assume a supernumerary office. Any person who, on the ratification of this amendment, is entitled to participate in a supernumerary program may continue to participate in that supernumerary program, which shall include the assumption of a supernumerary office according to the terms and conditions of the law which established that supernumerary program. Every elected or appointed Macon County official may participate in the Employees' Retirement System of Alabama upon the same terms and conditions as may be specified by law for any other employee in the same retirement system. Macon County officials holding office at the time of the ratification of this amendment shall be eligible to purchase service credit in the Employees' Retirement System for the time the official has served as a county official. For the purposes of this amendment, the words "elected or appointed county official" shall include any person appointed to serve the remaining term of an elected or appointed county official, including the county coroner, but shall not include a judge, district attorney, legislator, constable, school board member, or any official elected from a judicial circuit.