Opel Omega B immobiliser

Hello first of all, I need your help!!! I drive an Opel Omega B, petrol, 2,0L, 16V. So, well to the problem: The car has an immobilizer, which is operated by an infrared remote control in the ignition key. This IR remote control never works around it, if you need it! Either the “shit batteries” are always empty in the key, or you can dance around the car every time like a crazy idiot to try the key of all possible positions In the meantime, this “shit” has so much to do with me that I now want to bridge this fucking immobilizer. This should then be a valid rest in the box. The immobilizer should then be replaced by an independent alarm system. As far as I know, the control unit sits in a silver-coloured aluminium housing behind the passenger airbag. In addition, the control unit for the central locking is located in a black plastic in the lower right area of the passenger footroom. This central locking system, however, should have nothing to do with the immobilizer. Can anyone tell me how I have to bridge the control unit for the immobilizer in order to finally put this “shit” out of the way??? That saves a lot of nerves in the long run!! I thank you for your answers at this point already in advance! Mfg. Robert