This subchapter shall not repeal existing laws of this state relating to the retirement of municipal court judges and municipal court clerks but shall be cumulative thereto, specifically to §§ 24-8-401 and 24-8-403 — 24-8-408, and acts amendatory thereof. It shall in no manner affect the rights or status of persons receiving or eligible to receive retirement benefits under the provisions of §§ 24-8-401 and 24-8-403 — 24-8-408.