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Hi, if the ignition lock cylinder is removed, it should start if you hold the key as close as possible to where it would be if the lock cylinder was installed and you were starting it with the key. Try holding the key where is should be while starting with the screw driver. There's a round antenna right in front of the lock cylinder that has to send a signal to the key.
The only way to get rid of SKIM (sentry key immobilizer module) would be to get a new pcm (engine computer) and unplug the skim module. Once a pcm sees a skim module on the data bus, it will always look for an ok to start message from a skim module. So if you get a new pcm, leave the skim module unplugged, it won't look for that ok to start message and you could use keys without chips to start it. It sounds like you need a new lock cylinder for the ignition from what you told me starting it with a screwdriver. As far as the airbag, you could unplug it to disable it. I'm not sure if it's legal to have kids in the front seat though. Only vehicles like trucks with no rear seating have passenger airbag on/off switches.