I'm looking for a portable device that has jacks (3.5mm would be best but anything works) for a microphone input and speaker output, and then connects via Bluetooth to my phone or computer and appears to it as a Bluetooth headset. Audio played through the "headset" would be sent out out the speaker output on the device and signal sent to the input of the device would be "received" as if coming from the microphone on the "headset."
Does a device like this exist? I'm not sure what it'd be called or how to search for something like this.
This pertains to live media production, if there's a better SE site please advise.