What about coalitions and sub-pantheons?

Like, one king might take the ALL-LAW trifecta; another might prefer the ALL-GOOD trio; a third might feel that the neutral middle layer is the most pragmatic compromise (the non-good, non-evil three).

Yeah the state religion might tend to the Lawful left-hand side of the chart, but if you make the state pantheon a subset of 3 which INCLUDES one of those Lawful gods, then you've got a lot more room for creativity.

Plus, a lot of human pattern-formation seems to clump around groups of 3, so it's a natural-feeling way to present a sub-pantheon.