Notwithstanding any provision of this chapter, each special deputy sheriff, appointed pursuant to section 6-43 before July 1, 1999, shall become a member of the state employees retirement system on July 1, 1999, and vesting and credited service shall be calculated from said date. The provisions of this section shall apply to and include each such special deputy sheriff otherwise included under this section who becomes employed as a judicial marshal in accordance with section 6-38i, provided in no event shall an employee receiving payments pursuant to section 5-164a or section 5-192v receive vesting or credited service under this section.