That unit support is too much, and I wouldn't call a Theocracy "communal" as for as corruption, but 1 more early age government is a possibility. If added, it would be either Theocracy or some form of city state gov. (Oligarchy isn't a good name for a city state gov, for those of us who have played the mesopotatoia conquest scenario). I'm learning towards city-state gov, because that would be a better use of communal corruption. Then give it ****ty unit support (I doubt city states would be very willing to support "federal" armies for the greater good of their civilization). No production penalty, payed hurry, and I think it would balance out, and be a good alternative to stratocracy, the other early gov. That way if you didn't want to wait for republic or monarchy you could just go for one of those two.
City state gov would be representative of early greel or mesopotamian governments, while theocracy would be ancient egypt.
The only problem with another government is anarchy time. It's simply not worth it to switch more than once or twice unless you're religous. I could reduce anarchy time for all civs to 1-2 turns, but that's the religous trait's strongest selling point. It would seriously need some new cheap improvements or special units or something.