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Philosopher - you'll only get a response here if someone wants to develop a new plugin or modify an existing one to do what you want. Optional Plugins are not developed within the main calibre development stream, Most have been developed by someone who wanted the functionality, and they only make it into the Plugins list if that person is prepared to add new features and respond to user queries.
The fact that no one has responded to your post 689 is probably an indication that no one with developer skills has a similar need.
Have you read this ==>>
Introduction to plugins It contains further links to detailed documentation on creating plugins
BR