Has anyone ever tried to adapt the Birthright domain system to Middle Earth (any time period)?

I've been getting back into Tolkien since starting to read the Hobbit to my young boys, and it has me wanting to explore the North and the dwarven kingdoms, perhaps during the time with the dwarven Rings of Power. The Rings seem to me to lend themselves to domain-level powers, and I think it would be neat to have that reflected, along with the various dwarf vs orc wars and the other sagas that involve dwarves fighting, founding, losing, and regaining kingdoms.

That, and there are more dragons in the North... (some of which are the cause of lost Rings...)