Allow some pages of public space to be only accessible via a hidden URL

Customer suggested the following improvement when dealing with anonymous access:

In a Public space which would be Anonymous accesible, but at the same time, would not allow the Anonymous user to access that entire space but only a set of pages. For instance, I would set up a set of pages only for consumption for a particular client, but I don't want to create Confluence accounts for each individual. Instead, I would provide a unique URL which houses of all of the pertinent content the only way to find that content would be through the URL. This user would NOT be able to access the root Space folder or access any folders on the same folder hierarchy.