I wanted to dig in to a bit further, but the client just reset the whole thing and said "you don't get JAWS now". Project cancelled soon after that - unrelated to JAWS/workspace.
Don't have time now, but hopefully it will be resolved at some point. NVDA was 'good enough' for the testing I was doing, and it was pretty slick to know the audio was streaming and working without any extra configuration. Probably old hat for some folks, but I'd never experienced that before. :)