My choir sings at Confirmation at our parish each year. During the entrance procession, our normal routine is to sing 2 verses of "Come, Holy Ghost" (with the congregation) and then the choir sings Ecce Sacerdos until the procession is over and the Bishop is at his chair.
In the past year at Sunday Masses, we have begun singing the Entrance Antiphon after 1 verse of an opening hymn. I would like to include that as well during Confirmation, but singing a verse of a hymn and the entrance procession and Ecce Sacerdos would be way too long (and may be viewed as a little overdone). What would the ideal music look like during the Entrance Procession? I could inquire about skipping the hymn but am not sure that would go over (it wouldn't on a Sunday).
Singing one or two verses of Come Holy Ghost is likely singing only part of a sequence, so it's not something I'd recommend as worth doing, but understand that it is in fact done for practical reasons.
The entrance antiphon in the ritual from Ezekiel 36 is lovely and perfectly apt and I'd encourage its use:
Thus says the Lord: I will pour clean water upon you and I will give you a new heart; a new spirit I will put within you (Eastertide: alleluia)
Anyone wishing a refresher in the rite of confirmation can refer to this PDF from November 2011 from the Diocese of Evansville:
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