Poetry is notoriously hard to make money on - Bombadil was exceptional iirc. There may be a reluctance on the part of his Literary Executors to publish work that is unfinished if it doesn't shed light on the wider creation. I doubt copyright would be insurmountable since poetry is usually collectedcand anthologised. However its cost might make the project unviable.
I would love more letters and I think that would be justifiable since the publication of HOME may make more of them relevant.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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