After getting the quest, I opted to climb the walls and go in from the roof. I made my way through the priestly area (bluffing like a boss until I was caught), killed most people and left for the Siege Platform. After looting the area, I attempted to go back... and realized I really, really should've hard-saved when entering the zone. Ugh.
I'm going to try the savegame fix mentioned above and see if that gets me back in business. Really enjoying the game so far - my early game Ranger-Wizard-Fighter-Fighter-Priest-Chanter combo is wrecking face.
EDIT: Boom. Back in business! Only deleted the Int_02 parts of Raedric, not the exterior. Let the priest-tricking re-commence!