I spent some time discussing the situation with elmore, and we agreed that the least offensive course of action was to have piano, drums, and reed - that that will at least keep some of the flavor of his orchestration. It's certainly not optimal, but prerecording at this point isn't an option.
I've sent e-mails about the instrumentation and I've also asked for all finger pointing to stop - they're upset with me for going to the Festival to vent my frustration, and I certainly was upset about the entire situation, but now it's time to just get it done.