I'm happy to report that I've successfully installed this modification without destroying the bike. It did, however, take all day to do it, because every step was a learning experience. I was able to remove the fairing without destroying it, locate the correct cables on the harness, and make all of the right connections. Some observations...
* There was very little slack cable on the harness to work with, so not much room for error
* I should have practiced my soldering techniques before applying them to the harness. Very sloppy.
* There ain't a lot of space under the fairing, so the wiring bundles have to be arranged well for the fairing to be replaced without crimping.
After all connections were made, and before the bike was reassembled, I tried making a call from the garage. My wife could barely hear me. So, it was too late to do anything else, so I put everything back together. I tried again, and she could actually hear and understand me. So, with my spirits bolstered, I made a test from the road at neighborhood speeds, and she claimed to hear me well. The next day, I tried again from the garage, and again - she heard me faintly. But, then I fired up the bike, and called her at 75 MPH, and she heard me well - in fact I was speaking to her in a normal conversational voice. I'm not sure why it works better with the engine running, but that's when I need it to work anyway. So, I'm considering it a success, and I'm officially dumping my bluetooth headset.
Ed