The governing body of any county, municipality, authority or other political subdivision of the Commonwealth that does not participate in the retirement system or that maintains a plan that provides supplemental benefits to employees covered by the retirement system may, by ordinance or by resolution adopted by a recorded majority of the members of such governing body, establish for itself and its employees a benefit restoration plan established under § 415 (m) of the Internal Revenue Code and, if it deems it advisable, may create a trust or other special fund for segregation of funds or assets relating to such plan.