So to summarize, wedging something on one side of the bearing so that the worm presses tighter to the main gear makes the noise go away. But then it causes binding and the wheel will not self center anymore. There is another Russian guy that found a better solution. He claims that wedging the bearing will only last so long before the main (plastic) gear continues to wear and the sound comes back. His solution involves adding a thrust washer at the end of the main shaft which causes the worm to ride on a new surface of the big gear. IMO this will also be a temporary fix. Seems the only real fix would be to replace the big plastic gear. Actually that isn't even a permanent fix. I am used to putting 250k on a car and the plastic gear didn't even make it 100k. A better fix would be to replace the plastic gear with a metal one. I did actually see another Russian claim he had an metal gear made.
The Russian guy completely removed the EPS unit to add the thrust washer but looking at this thing I think you could get away with simply removing the lower part of the steering shaft, remove the 27mm nut at the end of the shaft and then pull the cover off, add the washer and then reassemble.
If I get some time this weekend I may attempt this.
Here is a link to the Russian page explaining the process:
https://www.drive2.ru/l/3207770/