Is a bit of a nightmare since cannot lock from the console if the door is open and if lock with door closed, it unlocks when door is opened.
Do not need full function, just the ability to lock the doors/hatch when outside the car or (not ideal) disable the door open unlock all. Do not need to unlock can do that with key, just lock.
Even just a LOCK button in the wheelwell or under the hood would work.

ps everything I am seeing says a PO has completely disabled the SKREEM so neither key nor fob sends a signal to the BCM (point B) but dome lights and console switches do work.