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Well, I'm afraid I'm not interested in preserving hyphens in that field, a bit too much work and also I doubt many of the metadata sources preserve the hyphens either.
You could however write a simple script to process the metadata using the calibredb command line tool. It could read the XML file and thereby extract the needed information and either directly correctthe publisher or stick the hyphenated isbn value into a custom column.
If you wanted to get really ambitious you could write a calibre plugin to do this as well.
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