Cabal duties in -other- cabals seem to take up so much of one's time, I can't imagine doing both without severely watering down what Heralds actually do, since one's "primary" cabal will receive priority.

What's more important to Aco-guy, his Fort duties or his Inn duties? It's acceptable to say Fort duties, but that's why this kind of thing would neuter Herald a little more than it already is.