Try using Away in a Manger (Lullabye) in your Christmas Eve service as special music right before the sermon. It’ll work especially well just like you hear in the demo: a female lead with male background vocal. Because of the high tenor BGV and alto ranged melody, D major is the best key for this arrangement.
This classic hymncharts.com arrangement follows the same format I’ve been using for many of my more contemporary arrangements: the melodic riff in the intro and midtros turns into a simple vocal bridge.