Sorry it took a while, been doing school + choir + work. As massamuusi mentioned, the project sounds interesting.

I believe we do have a microphone at our choir's place, so one possibility is to give the necessary lines and I (maybe a couple of others) can do takes and send a link to the URL where they are located as wav's.

For fine-tuning the atmosphere or expression, best choice would be to actually meet and do the takes with discussions on how they should be done exactly.