A participating local district electing retirement programs under section 18453, subsections 1 to 9, may, by filing with the board a duly certified copy of its action:
1. Discontinue benefits. Discontinue any benefit under any of those subsections to any person qualifying for the benefit who was hired after the effective date of the district's action; and
2. Substitution of benefits. Substitute for the discontinued benefit any other benefit provided in this Part.