Erizon
Meagon.. (stuff) ..
Actually, only two governments pull members from civ-aligned guilds.
Actually, you're dead wrong.
The only government that doesn't do it are the Fyro, they accept applications from anyone who's a citizen.
Zorai, Tryker, and Matis all require that you be guild leader or high officer of an alligned guild, with the Zorai and Matis additionally requiring specific religious allignment as well.
The Tryker at least, and I think all others, require specific fame levels on top of that (at least 50 fame with your nation).