Not sure if something like that exists. A dongle can take care of streaming audio and connecting other peripherals, but the same won't receive audio unless you are using the same protocol as a bt headset and use the mic channel to send the audio to pc. This would typically be a mono low bandwidth stream.
E.g. if you connect a bt headset to your pc via a dongle, you can still listen to the sound of its microphone via the pc speaker if you configure your mixer correctly.