Notwithstanding the provisions of Kan. Stat. Ann. §§ 74-4902 and 74-4911 to the contrary, an employee of a participating employer who was born on January 20, 1914, and who was employed by a participating employer from July 1, 1973 and who was employed by said employer from September 1, 1970 until December 31, 1970, and who is employed by a participating employer on the effective date of this act, shall become a member of the Kansas public employees retirement system as of September 1, 1970, upon the payment of appropriate employer and employee contributions. Upon the attainment of membership by the provisions of this act, such employee and his or her participating employer shall thereafter be governed by the provisions of the Kansas public employees retirement act.