" This sentence seems awkward to me though, and even sounds faintly illiterate, though I can't quite put my finger on why. " Some sentences of this form work OK for me, such as "What I saw was big and blue". ", as in, for example, "What refreshments were provided were inadequate".
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napoleonponapaif I add a nounAdding a noun makes a sentence that is a bit non-standard in my opinion.