Is Indigenous Military Outposts bugged?

[Arjos]

That approach is very simplistic, as was EBI's, in Asia and Africa the Makedonian Dynastai were able to set developed forms of government, because there already existed complex multi-secular practices, which the Hellenistic polities preserved and adapted to them...

The idea that the Romani and Latini would accept an Hellenised Persian form of government in a matter of few years is completely fictional...
Also we cannot invent forms of government that did not exist (as the Hellenes never captured the west and formed anything more than colonies there)...

Thus you will have to hellenise the locals or allow them to keep their forms of government in the west, much like what was the common practice among Hellenistic polities...

Not that this prevents you to gain access to better troops in the west, quite the contrary...