Thanks for the input, all.
As many have noted, none of these really solves the issue without substantial overkill, so I'll just write this off as 'there is no good solution'. That's an answer, so that's helpful.
For those who questioned the need - I produced a book/month, and presently refer to the ISBN in two places in each. An automated system would reduce the risk of not entering the ISBN as required, which currently requires pasting in several places - the metadata, a title page reference (potentially to other ISBNs as well - e-book, paperback, hardcover), and a copyright page reference. These aren't all required, of course, but fit my preferences. It would have been easiest to just enter the data once and let it replicate (as is possible in my ODT document), but if it can't be done, it can't be done (easily). The search and replace is the closest practicable answer, and the one I've been using.
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