Back before Uk insurance companies realised alarms were a complete waste of time, I had a switch installed close to the rear shock fixing. It deprived the engine ignition switch of it's ground, so fail to set the switch the right way and no amount of screwdrivering the ignition would result in a running engine. Being on the earth side and NC, when it finally failed, I lost the ability to turn it off rather than having to strip it off or bypass it.
I'd avoid the relay thing, it's electronic and therefore as likely to go wrong as a full alarm system.
IMHO, a big chain is still the best protection though.
Andy
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