Resolve problem of reusing CE nested routes in EE

The following discussion from !8180 (merged) should be addressed:

• @grzesiek started a discussion: (+3 comments)

  I wonder if there is away to reuse route namespace defined in CE. This way of overriding routes is really fragile. If we ever change something in CE, we would get a completely different path to a resource in EE. Thoughts @godfat?