Buy a new part and mount it to the firewall by the egr valve and connect the wires and vacumm lines and leave old one on block.
You mean, I think, ignition switch module, which is the location of the ignition switch.
Yes, a modulator is required if you use a RF cable to connect it to the TV.
it is on the firewall and difficult but not impossible to get to and replace.
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You do not need a key to replace the ignition switch.
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If it is a manual transmission it should have a clutch safety switch not a neutral switch. Usually found at the upper end of the clutch pedal under dash area
you dont HAVE to remove it but it does make it easier. removing the column it not very difficult.
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