Can the priest alter the text and ceremonies of the Liturgy?
No, as they do not belong to him. The priest is the servant of the Liturgy and not vice-versa. Altering the Liturgy is similar to the violation of copyright, the misuse of someone else¹s words. In the Ukrainian Catholic Church, liturgical changes are the competency of the Major-Archbishop together with the Synod of Bishops, with the approval of the Apostolic See.