This is one of the hidden dangers of using choral arrangements as congregational song. One of the favorite tricks of good arrangers is the placing of the song in very low key for the choral beauty of the setting. It makes terrible accompaniment of congregational worship because it forces people to invert the melody at odd places to accommodate their range. The sound of the men in the congregation shifting to a lower octave in the middle of a phrase is sign the song is in a bad key. Use a hymn as a monthly or seasonal theme.
Hymns carry themes from week to week very well.
If the the hymn has both stanzas and a refrain, use a different stanza each week. I have used Angels from the Realms of Glory as a theme for the whole Christmas season. Project the words for use in the body of a song set. I generally use hymns at the beginning of a song set because I like for the congregation to use hymnals. However, when I work a hymn into the body of the song set or use it as a finale, I always project the words for the congregation.