Perhaps you can do some query like 'set forumid=newforumid where thread.forumid=archive.forumid and thread.post contains ('whatever word')' (no, that is not a real statement in any way, but hopefully it gets the point across).
I would test it by first creating a 'fake' forum and using that for where to move the threads. Then go through them visually and then you can mass move them from that forum to the correct forum. So, the 'fake' forum is kinda an intermediate forum.
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