Avi - With Airfoil Satellite you can turn your computer into an AirPlay receiver. If you then point Airfoil at Airfoil Satellite, it can then re-broadcast it out over [AirPlay, Bluetooth, forthcoming-Chromecast]. So yeh, it's not the most elegant setup, but it should certainly be do-able.

As for receiving Chromecast, keep sending in those feature requests and we'll see.