Your key situation will not be easy to resolve if the car still has its original electrolock cable. That being said, you should try and remove it without damaging it. Good, repairable ones are very hard to find. There are folks here who repair and restore them and can provide a key but you need to give them the best raw material possible.
As Mr Monty posted, a generic on/off key switch or toggle switch from the parts store and some simple wiring will suffice to get it going and use it until the electrolock has been restored.
Looks like a really cool car. I hope you plan to keep it as original as possible. They are only original once.
Mike
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