There’s many an old Protestant hymn that’d be suitable for singing in Catholic church as well. Just not anything written after around 1900, for the most part.
The bad news is that the dodos think that we're too dumb to understand:
"Thou art, Which wert, thou hidest, he taketh," and other older than yestrday inflections of English verbs.It's so LAME and irritating (especially if you know the hymns by heart.) Then you get the revisions of texts so that nobody ever has to sing the masculine 3rd person pronoun and mean Gawdamighty by it.
Maybe it's a "marker" of bogus ideology that it's allergic and hostile to beauty and elegance.
how about “amazing grace” and “almighty fortress is our God.”