Niner: thanks for the ideas
I like the idea of making it non noticeable at the dealer, I will have to take my car in some time in the next few months to get a free ECU replacement (recall). I think I will get enough flack about my car without the kill switch. Taking it back to stock (as far as the kill switch) in the parking lot is a big +.
Why bother with the relay though? That wire looks to be low current as it is tripping a relay itself. All I would need to do is to find that wire, add a NC switch and route it back to the splice point. If I hide the splice the dealer should never see it