The governing body of any municipality with a population in excess of one hundred thousand (100,000) persons, upon determination that municipal security or efficiency is involved in the judicial process in the handling of appeals from municipal court and of related matters, may contract to supplement the salary of county judicial officers in the county in which such municipality is located in exchange for the surrender by such judicial officers of the right to engage in the practice of law. The salary of such judicial officer so supplemented shall not exceed the salary of circuit or chancery judges in such county or of municipal councilmen, whichever is less.