In the East, the bishop is not as involved in the practice of Confirmation. The Eastern way is to fully initiate infants at baptism. I wonder how widespread the Roman method was before the Council, and what the reception in Easter Churches was when the traditional practice was restored?
The established practice in respect of the minister of Confirmation that has obtained from most early times in the Eastern Church should be fully restored. Therefore, priests validly confer this sacrament, using chrism blessed by a patriarch or a bishop.(Cfr. Innocentius IV, Ep Sub catholicae, 6 mart. 1264; 3, n. 4; Syn. Lugdunensis II, an. 1274 (professio fidei Michaelis Palaeologi Gregorio X oblata); Eugenius IV, in Syn. Florentina, Const. Exsultate Deo, 22 nov. 1439, 11; Clemens VIII, Instr. Sanctissimus, 31 aug. 1595; Benedictus XIV. Const. Etsi pastoralis, 26 maii 1742, II, n. 1, III, n. 1, etc.; Synodus Laodicena, an. 347/381, can. 48; Syn. Sisen. Armenorum, an. 1342; Synodus Libanen. Maronitarum, an. 1736, P. II, Cap. III n. 2, et aliae Synodi particulares.)