Notwithstanding the provisions of section 8.407 of this Charter, from January 3, 1992 through March 31, 1992, in return for acceptance of a wage freeze for fiscal year 1991-1992, all recognized employee organizations representing classifications electing to remain within the coverage of Charter sections 8.401 and 8.407 may, on a one time only basis, elect to bargain for no more than two additional paid training or furlough days per year to be effective only in fiscal years 1992-93, 1993-94 and 1994-95, and a dental plan, in recognition of the wage freeze for 1991-92. Such bargaining shall not be subject to the impasse procedures provided herein or any other provision of the Charter, ordinance, or state law.