I’ve not heard of any plugin that currently provides this functionality. This sounds like a perfect opportunity for custom WP development – either you hiring someone to code this for you (which could then be very useful to others desiring the same functionality), or someone in the WP community spontaneously filling a need 😉
I’ve been customizing WordPress lately to serve as a web app for all sorts of purposes I couldn’t have imagined just a year ago. What you want might not exist yet, but it’s totally doable…