Once upon a time, J&M offered wired and battery-powered Bluetooth dongles for their JMCB-2003 transceiver. Bear in mind these are 6-wire setups: Left and Right Channel Audio Output and Mic...with separate grounds for each.
Hondaline/Clarion's 5-wire setup is "partially" compatible, as they use a common ground connection - ostensibly for best channel isolation and the prevention of talkback loops. I've made various combinations of this stuff work when interfaced with a Kennedy Technologies FRSet-4. Or, one can roll their own setup using miniature 1:1 isolation transformers of the correct impedance and a low-gain follower AF amplifier.
The real gotcha: There are two specific protocols which a Bluetooth headset can use -
but not at the same time.
A2DP (Which is stereo output and no mic input)
HFP (Which is monaural output and mic input)
Thus, you cannot listen to the factory I/S radio through a dongle and use the CB radio in Transceive mode.
LAME.
My Tourer and my two Concours 14s came without any sort of radio gear, so in addition to J&M and Hondaline CBs I equipped them with the ham radio transceiver shown below. It can also receive AM/FM stereo and various public safety bands...plus the ten weather channels. Yaesu offered an optional Bluetooth transceiver for it (which all of mine have) that allows pairing with an HFP or A2DP headset.
If I'm paired in Stereo (A2DP) mode and switch to one of the saved ham band memory frequencies, you'd think the thing would re-negotiate the connection and allow me to use the microphone to talk - right?
Wrong.
MORE LAME.
This IMNSHO is the number one reason why Bluetooth will eventually fall flat on its face as a powersports communication connection medium - unless the Bluetooth industry working group gets with the times and fixes a sore lack of functionality.
