The biggest problem overall is that there is currently very little in-game to model the rather complex nature of internal administration in Classical states. The system for subject states is basically copied from EU, in which clients are mostly just a timer until you can annex. Something more akin to CK might be better, although the mechanics would still need to be significantly altered to fit the period.
For example, in Ptolemaic Egypt the Greek cities (Alexandria, Naucratis and Ptolemais) were run as Greek poleis almost completely independently from the administration of the rest of Egypt (which was still largely run in the traditional Egyptian manner, albeit with many administrative positions now filled by Greeks).
In Judea's case, the priesthood definitely maintained a substantial control over life in the region, but they did so on behalf of their Hellenistic rulers (as had been the case under the Persians). A more accurate system would be to use the cultural privileges system already present in I:R, although for some reason this is treated in-game as exceptional circumstances rather than something that was mostly standard operating procedure as most non-Greeks in the Hellenistic kingdoms were administered by existing institutions, usually the native priesthoods (which possessed considerable control over the economy and were often relied on for collecting taxes).
Side note; why is the Levantine culture group (Jewish, Phoenician, Punic, Nabataean) separate from the Aramaic group? Historically, both the Hasmonean Kingdom and the Nabataeans used Aramaic as the principle language of administration.