After trying all sorts of things, some topical and the rest more substantive, I became very angry. I set aside a day to open up the rear, jack it off the ground and work. It went up about four times before I was satisfied. Making the tension right was the hardest part. Getting the belt to move from one side to the other was easy. Getting it to just ride in the center without hitting the flange was a pain but I persevered. In all instances I powered up the car in first gear while it was off the ground. I even went so far as to make small adjustments while it was running and did the last part by ear. It doesn't hit the tire. It only chirps quietly during deceleration at the low end of the speedometer. In all cases a short test drive under load caused it to go back on the lift for more work until it behaved.
Loosening the tension was a big plus. It was simply too tight. It was making noise no matter where it fell!
Maybe, just maybe, I can leave the small case of 3M ear plugs at home!
The rear sprocket is not making the noise but now the bevel box is the one. I have also noted that with the tension being loosened the bevel box whine is almost gone! On mine it wasn't much to begin with.
Fits and starts. Fits and starts.
