make a short list of what you can stomach
I wouldn't gauge engagement with what's "easiest." Liturgically and theologically the Holy/Glory both should take precedence over the Agnus Dei. I would implement the Sanctus first, and use the ICEL Gloria (perhaps with a complimentary accompaniment) until all else is achieved and then fold the newer setting in with care.Kyrie and Agnus are easiest to replace...Sanctus next, and Gloria last.
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