> Us papists go straight to "amen" and a mic drop after "evil". That doxology (in a slightly different form) is familiar too, but it's used somewhere else.

“Somewhere else” being... almost immediately after the Lord's Prayer, but with the priest saying the Embolism (“Deliver us, Lord, we pray, from every evil, graciously grant peace in our days, that, by the help of your mercy, we may be always free from sin and safe from all distress, as we await the blessed hope and the coming of our savior, Jesus Christ”) in between.