Any court reporter who, on January 12, 1969, was a member of a county retirement system not participating in the Oklahoma Public Employees Retirement System shall have the option to continue as a member of said county retirement system or to become a member of the Oklahoma Public Employees Retirement System and shall be entitled to credit for all the years of prior service as a court reporter, but such court reporter shall not be entitled to participate in the Uniform Retirement System for Justices and Judges.