Got myself 2 of those bad boys, flashed with bat file from GitHub - ykeara/SteamVR-Dongle-Flash: A simple Guide and batch script to flash steam controller dongles to watchman dongles for SteamVR/OpenVR (had to adjust Steam location) without issues while both were plugged in. Connected controllers while Pimax was disabled. Both disconnect if I unplug the dongles. Dongles are in PC, 3 meters away from me. Played “You’re Mine” track in BeatSaber, only had 2 slightest drifts of the right sword. I guess it’s way better than it completely flying away. I may think on how to move dongles closer to my playspace, I already have a few ideas. Thanks for the flash!
@Thall console didn’t suggest to input anything, just shown my devices. Whatever, I guess, I am happy for now. 