Umm just use the Virtual library facility inside the server. i.e. any user that wants to restrict the view to a virtual library can simply choose that virtual library by clicking the three dots in the top right corner and choosing Virtual Library.
Instead of describing your somewhat convoluted existing setup, why dont you describe what you are actually trying to do. And I dont see what apache with LDAP as a reverse proxt has to do with anything. The calibre server does not care how it gets the authentication headers, whether directly from a browser or via a proxy in the middle.
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