To think about.
Currently it is possible to assign profiles to content types. But not possible to assign profiles to specific synchronized contents / pages of the user-directory.

Two solutions :

1. A RightContextConvertor similar to "Content2PagesRightContextConvertor" but working with synchronized contents. Indeed, currently it tests the object with an

   object instanceof WebContent

   , whereas synchronized contents are not web contents.From a synchronized content, this convertor would return, if it exists, the associated page(s) of the user directory.

2. Or a RightAssignmentContext (server and client sides), similar to ContentRightAssignmentContext, but searching on user directory contents, allowing to assign rights on them.