Is there such as thing as a Bluetooth receiver USB dongle that receives a Bluetooth audio transmission and emits it into a USB connection? It would be the opposite of an Avantree DG80, which receives a signal from a USB socket, and transmits it via Bluetooth. I've looked hard, and can't find such a thing for audio. If it exists, it would enable Bluetooth with the Topping D10s, which only has a USB input.