This looks lovely!! Nice workaround to make things more organised. Thanks for sharing!
Just wondering, is the “system modeling” and “related entities”, new databases? They are then unused, and are just to make prettier naming in the entity view? Lovely workaround!
I think this is related to this: Add a view of "Collection" entities within another entity that are not related, just for reference - #2 by RonMakesSystems. Then you could just create a view to show all relations, and hide the real relations. Like you did, but with proper naming.
Its almost like polymorphic relations if you don’t think about it too hard haha
Good stuff!