Perhaps the smartest thing then is to remove the CAN-bus Connection to the PSM. I don't know if that will work, but it seems that the probablility that at least seat movement can be handled by the module locally is fairly high.
For the passenger side it's 100%, since it only has power in.
The communication is there since in a "real" install, you also get external mirror memory as well as automatic seat positioning dependent on which key is used to unlock the car.
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