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You could use a normally closed relay and energize it when you want to cut the power. But then a thief would have to do to get around the system is cut the power to the relay or the computer. Security vs convenience. Using a normally open is more secure but will cause a big inconvenience if something goes wrong with the PC.
As for the steering wheel lock, they are usually mechanical so you'd have to rig up a solenoid to engage the lock. If it is electrical already then just tie into it.
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