As much as I like the finches I can't answer the
specifics as to what it is, but I think it would be a Red-eared Firetail. Going
by finches in general, surely it is not unusual for beak colour to start to
change, before it has its first moult into adult plumage. So the
combination you describe makes good sense to me. Both these species are rare in
captivity so the chance of "going to a spot for red-eared firetails and seeing a
lone, aviary release beautiful firetail" is surely close to zero.
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