Is it me or have I missed something along the way , you are removing the key / steering lock from the car and replacing the electrical side with a switch now this I can see but now for security of the car you have an immobiliser fitted good idea. But to use this you have a KEY
Ok my thumb and 2 fingers are numb some time's bad some time's good and fiddling with a bunch of key's under the dash was awkward and the immobiliser was in a awkward place to so move the immobiliser to the middle next to the big red key these two can be attached .The ignition key can still be used if i walk away from the car for any time or distance it can be left in the ignition or left in if i'm not far away.eer you did ask