Actually the Toyota speed sensor works fine. Before MB started offering rebuilts the price for compressors was over a grand. We used many Toyota compressors. The only time the speed sensor has ever been a problem that I have seen was on a rebuild where the shaft was too far from the sensor. I have seen this twice.
Removing or bypassing the speed comparitor just makes sure. I think MB built that system to protect itself. The only people that I know that would drive a MB with the belt squeeling would be people in warrantee who didn't care what broke.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician