The alarm switch in my driver side lock is bad so I have to unlock the door with the key, open the door, then twist the key back to lock (it doesn't lock, of course). If I don't do that, the alarm will sound.
What you can do so the car is usable is disconnect the factory alarm. Lift the passenger carpet and detach the false firewall. There's an electronics box with Becker markings and two ~12 pin connectors. Remove the connector furthest from the floor (80% sure, if not, remove the other one). This disables the factory alarm in my car without any other effect.
I can't help you with the radio.