The coordinator wrote me back and said the only way to have seating for all 100 people for the ceremony would be to send everyone downstairs to flip over the room. Which would be ok, except that she said it would take 1.5 - 2 hours to do this. Is it just me or does that seem like an unreasonably long time to flip a room?
I also asked her about setting up the ceremony with reception style seating, but she did not say anything about that in her response, so I guess that's not an option.
She also said that if we were to have seating for 100 for the reception, instead of seating for 50 and cocktail tables, there would not be much space to move around.
I guess it's time to keep looking. bummer.