Notwithstanding any other provisions of this Charter, the Board of Supervisors shall have the power to perform any and all acts necessary or appropriate to implement any provisions of the Education Code of the State of California which contemplate that teachers in the San Francisco Unified School District and the San Francisco Community College District shall not be members of the San Francisco City and County Employees' Retirement System but shall be members only of the State Teachers' Retirement System or which contemplate that such teachers may elect to be members of the State Teachers' Retirement System and not to be members of the San Francisco City and County Employees' Retirement System.