Notwithstanding any other provision of law, for fiscal year 2006 and each fiscal year thereafter, for the purpose of adjudicating Indian probate cases in the Department of the Interior, the hearing requirements of chapter 10 of this title are deemed satisfied by a proceeding conducted by an Indian probate judge, appointed by the Secretary without regard to the provisions of title 5 governing the appointments in the competitive service, for such period of time as the Secretary determines necessary: Provided, That the basic pay of an Indian probate judge so appointed may be fixed by the Secretary without regard to the provisions of chapter 51, and subchapter III of chapter 53 of title 5, governing the classification and pay of General Schedule employees, except that no such Indian probate judge may be paid at a level which exceeds the maximum rate payable for the highest grade of the General Schedule, including locality pay.