From the pdf:-

Now that I have this auxiliary audio input, I connected it to the stereo output wires of the T605 bluetooth kit. The T605 also has an
auxiliary input so you can pipe musing through it into the car stereo. If my CD-Changer still worked, I could connect the 3 wires from
the white connector (blue, green, and black) to another set of RCA jacks and then connected these to the T605 stereo input connector
(using the appropriate adapters). That would allow the CD-Changer to still work and have the bluetooth.

 

Yes, I just read it. In short it just has the switch I am trying to make outside my bluetooth inside itself I am gonna check if newer version are available with similar function.

 

Honda Wireless Bluetooth Streaming Handsfree Interface :: HONDA :: XCarLink

This is the closest I can find that is even locally available (not the example I am giving). However my local dealer didn't specify it as Honda unit, but is offering it as a universal solution. The nice thing is that their showroom is at walking distance from work, so I am going to check tomorrow if this is compatible. Looks like it covers all the basis - aux out, mute, aux in, steering wheel / radio control for both handsfree and bluetooth (seems a bit hard to believe thou). Fingers crossed