Thanks – that would be a great option if I thought I'd be doing the next round of this book. But this is a large textbook publisher who's likely to send it to India next time around. We're only doing a minor repackaging for this edition so there's no budget for inserting index markers and generating a new index.
It's pretty common that I have to pick up a book done by someone else and not set up to take advantage of things like indexing or cross refs etc. So, I'm looking for an “afterthought” option.
It occurred to me that I could potentially export the index to a tagged text file, fire up my old G4 in Classic mode and use Torquemada to replace all of the numbers. I've never used it with Indesign tagged text, so i don't know if there would be a lot of other numbers in there that were part of the tags that I'd want to preserve, so that might be a problem. But if so, we could just strip it to plain text and reformatting it would still be faster than changing all the #s by hand.
Is there anything like an equivalent of Torquemada that I could use on the text in OS X? Does BBEdit do this?