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As far as I know, Calibre does not have an in-built feature to ignore specific identifiers when downloading metadata.
A possible workaround might be to use a plugin or write a custom script that post-processes the metadata and removes unwanted identifiers. Although this still means an extra step, it could be automated to run after each download, thereby reducing the hassle.
Remember that any modifications to the software or use of third-party plugins should be done with caution, and make sure to back up your library before making major changes.
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