I'll try and do that with Gergovia which is the only settlement the Arverni have left, just beat them to a pulp,(Blame me for being impatient) but keep them alive until they build it (give them money, maybe use process_cq every turn or create_building (if it works)). I captured a level 5 MIC in Bibracte but it was still on time of Freemen and couldn't build Brihentin (not sure if they're tied to a reform or not) so I destroyed it and rebuilt it to level 4 using process_cq. Time of Soldiers hasn't come yet, though I've been making Dauerdanoch, Large Cities and Temples high priority, maybe I just dont have enough large cities yet.