The way Akkadius import script does it - as far as I can tell - is just starts filling in NPCs at the next available ID. I go back and drop them all in the original range - "<zoneid>###"
If you've not used the tool, you really should give a look. It reports the SQL it's just run, so I usually import to a dummy DB, then modify the queries before importing to my production DB. All in all a very powerful tool. Even moreso since Akkadius' update script will bring super old databases up to current schema with a minimal amount of manual effort.
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