Notwithstanding the provisions of this article or any other statutory provision, where an existing city and a county consolidate into a consolidated city and where the county at the time of consolidation is providing all school services to the existing city by contract pursuant to § 22.1-27 and the voters of the county have approved direct election of the school board, the consolidation plan or agreement shall provide for the election of school board members directly by the voters of the consolidated city without the necessity of a further referendum under § 22.1-57.2; in such case, the consolidation plan or agreement shall provide that the members of the initial school board shall be elected from the municipal election districts designated in the consolidation plan or agreement. The provisions of § 22.1-57.3 shall apply in all other respects.