If one is looking at works in English and including rather neo-Romantic 20th century composers, I recommend: John Ness Beck, A Hymn to God the Father (both SATB and TTBB versions; ravishing; the accompaniment is really pianistic but if done on organ with the panache of, say, the 'graves opening' section of the Dubois, is fabulous--the wretchedness of sin winding and crashing its way through our lives is absolutely in there)
Craig Courtney, None Other Lamb (also makes a good solo or duet)
Mark Hayes, Lenten Song (with oboe obbligato; I use flute because our organ is one manual; don't be put off by his usual oeuvre)
The Salieri passacaglia De profundis is also very good in Lent, even though the specific text does not appear in the propers.
PC, I'm gladdened that you mention those two American composer/arrangers, Courtney and Hayes. They are among a throng of very understanding and not uninspired crafters whose aspirations may be to enable lesser ensembles to still reach for excellence. Lots of Hayes are far from walks in the park. But among those folk, and others like Jos. Martin, John Leavitt and Hal Hopson, there can be found much more than dross if one knows what to listen for. In the upper level I'd also include Stephen Paulus (A Lenten Carol is quite accessible) and works by Randall Stroope and Mary Caldwell.
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