This has been rattling around in the back of my head for a few years.

The Shire: Obviously Delta, probably SLI.
Gondor: Gamma, probably LIE -- or possibly ESI.
The Elves: IEI, obviously. Especially Lothlórien.
Rohan: SLE.
Mordor: Beta probably. Se-valuing anyway.
Isengard: EIE?

The transition between the Elves leaving and Man becoming dominant in Middle Earth could be seen as a Quadra progression from Beta to Gamma.