Have you considered using a Plugboard to number your series instead? Personally I find that works well.
The problem with having an omnibus per series is that you'll end up with a small number of huge books on the Kindle. The Kindle won't mind this, but it will quickly fill up the storage space, and you won't be able to delete any book until you've read the entire series, which doesn't seem like a very good way to manage your reading.
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