The officers, officials and employees of the Administrative Office of Courts and Department of Court Management shall be entitled to insurance, retirement and other state employees’ benefits regardless of whether they are not under the State Merit System or employed in whole or in part by grant funds; provided, that for retirement purposes the state shall contribute only on the funds paid by the state, and such salaries as are paid by the state shall be the only amounts included in their average final compensation unless additional employer costs are appropriated from the grant funds.