The provisions of § 24.2-685 shall apply, mutatis mutandis, to any county seeking to change its form of government pursuant to Chapter 3 (§ 15.2-300 et seq.) of Title 15.2 if the effect of such change in form would be the abolition of an existing office created pursuant to Section 4 of Article VII of the Constitution of Virginia. In such case, the circuit court may order a referendum under § 15.2-301 only if requested by a voter petition meeting the requirements of § 24.2-685. In such case, a question in substantially the following form shall be listed first on the ballot and be followed by those provided in § 15.2-301: “Shall the County of ______________ be authorized to change its form of government to one which would eliminate the elected office(s) of ______________?” An affirmative vote on the subsequent question or questions on the ballot shall be given effect only if a majority of those voting in the referendum have voted affirmatively on the first question to authorize such a change in the form of government.