the most obvious choice would be to edit the Plainchant Gradual according to Divine Worship.
I do know that the US ordinariate hymnal in its later stages of evolution, so perhaps the project of the graduale was put on the backburner in order to work on the hymnal instead.
Hear, hear. No Catholic with any taste can simultaneously reject all post-conciliar music and remain attached to that trash. Almost every "Catholic hymnal" from before Vatican II is at least faintly embarrassing for that reason. (Not that what followed it was any better.)devoid of the "traditional" rubbish from the turn of the twentieth century that is sadly still republished in so-called "traditional" hymnals
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