A couple ideas of how to share the content of a page - using existing Confluence functionality - if you don't want to add a user to Space Permissions are (I) copy the page to a space they do have permissions for or (II) export the page to Word or PDF.
Do either of those work? There are no options I'm aware of to have a user see a page dynamically if they don't have permissions in the space. For example, the Include macro will not work for users without permissions in the space where the page is located.
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