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Putting that info in the ids field sounds very wrong to me. They are not an "identifier" which uniquely identifies a book, they are a code that defines some aspect of a book. And they are going to be a pain for you to maintain all squashed into that identifier textbox.
A custom column is the recommended approach. As for quick access, I assume you mean via the tag browser? You can have custom columns displayed in the tag browser too if you tick the "Show in tags browser" checkbox in the custom column edit dialog.
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