No benefit enhancement provided for by § 24-5-118 shall be implemented if it would cause the publicly supported retirement system's unfunded actuarial accrued liabilities to exceed a thirty-year amortization. No benefit enhancement provided for by § 24-5-118 shall be implemented by any publicly supported system which has unfunded actuarial accrued liabilities being amortized over a period exceeding thirty (30) years until the unfunded actuarial accrued liability is reduced to a level less than the standards prescribed by § 24-1-101 et seq.