Are Kill switches enough?
Learned a few thangs from your Security comments. I like the tip of turning front wheels to discourage towing it away.
I discussed Viper security pkg. & basically only starter kill relays are installed these days. Tapping into any of the ECM wiring is fraught with law suits from customers who claim they were not told that under some circumstances would require the dealer to reset engine codes, or a faulty relay could strand them without warning, etc.
I begged him to consider interrupting some of the ECM wiring, but he will not. The best he can offer is to hide the starter solenoid relay splice the best he can, and install a few more ($25) horns. About louder horsn, he reports the law limits them to 120 dB each, but more horns will produce more noise at that limited level, and many go that route.
I too have many $thousands invested in my truck's infrastructure & I don't even want to think of starting over! A call to my insurance agent resulted in learning that up to about $5K in "customizing" is included; more than that and a list of equipment parts & installing labor is needed. When I submit that list, I'll get a quote for a rider to our policy. If I remember, I'll share that info with y'all.
Wally