What I'm saying I'd like to be able to do is to select a tune (say FID 0x201) and say that everywhere it appears in a playlist, it should be replaced with a different one (say FID 0x301). So the first one becomes an orphan tune (and candidate for complete removal) and the second one gets n extra references. I suppose it's a special kind of Paste operation ("destructive paste" or "paste over").

In reply to:

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The only time that "Replace Tune" will replace multiple playlist-instances of a song is if they really are the same song, copied between playlists, as described here.

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That's exactly what I'm thinking of. A third of my tracks are only linked once, but of the remainder, 5 or 6 links is common, and some have 10 or 11. The extremum is currently 586, but I don't expect to have to replace that one ever!