In addition to the five board members provided for herein above, there shall be one alternate Zoning Board member whose term of office shall be one year. This alternate Zoning Board member shall be appointed annually by the Town Board and shall serve upon the call of the Zoning Board Chairman as a substitute for a member who is unable to participate because of a conflict of interest. The provisions of § 267, Subdivision 11, of the Town Law are hereby superseded and said alternate Zoning Board member is hereby also authorized to substitute for a member who is unable to participate for any other reason than conflict of interest, upon the call of the Zoning Board of Appeals Chairman.