I BELIEVE that the PC just changes info going into the ECU, take it out of the equation and it's all back to normal. I'm sure someone will correct me if I'm wrong.
That you're hearing the fuel pump prime right after it dies isn't good from a trouble shooting point of view seeing as it means that the problem has already corrected itself which will make it a hard problem to find.
I like your thought of the kill switch. If it were me I'd take it apart, bridge it, and test it... although that won't tell you if the wire running from it is itself bad. Seeing as your lights, gauges, etc... stay on when it dies then I'm thinking "no" to ignition. I believe the TOS is wired to close a circuit if activated so I don't think it would be there either.
I hate electrical. My TLS went through a period where I kept blowing the acc fuse. I carried a box of them on me for a while until I realized that the horn was grounding out on the frame, but only if the bars were at oh-so slight of an certain angle when I hit a very certain amount of a bump. A little pull on the mount and all was good again.
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