Temporary assignments of judges and justices of the Unified Court System pursuant to article VI, section 26, of the Constitution shall be made by the Chief Administrator of the Courts, in his or her discretion, subject to the Constitution, art. VI, section 28, subdivision b, after determining the need therefor and the advisability thereof consistent with the objectives of the Unified Court System; provided, however, that such temporary assignments shall be made with due regard for the courts from which and to which a temporary assignment is made and with due regard for the official and appropriate interests of the judge being assigned. When made for a period in excess of 20 calendar days, such temporary assignments shall be made by the Chief Administrator in consultation and agreement with the presiding justices of the appropriate appellate divisions on behalf of their respective courts, provided further that if the Chief Administrator and a presiding justice are unable to agree, the matter shall be determined by the Chief Judge.