any negotiated grievance procedures under
section 7121 of title 5, including any provisions relating to binding arbitration, shall, with respect to any personnel action to which subchapter II of chapter 75 of such title applies (as determined under section 7512 of such title), be available to the same extent and in the same manner as if employees of the Panama Canal Commission were not excluded from such subchapter under section 7511(b)(8) of such title.