Everything was going so good

Doesn't really change the diagnostics needed. Just adds some wires. It is certainly possible the ECU fails when hot but that would not explain the failure to shut down.
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Well since I was recently in my steering column multiple times I am going to start there. I have 2 ignition switches and I have had them both in the car and the not shutting off symptom was present on both intermittently so its not the switch unless I have 2 that act the same. Maybe all the routing and re routing of the wiring in the column caused a bare wire and it's shorting out. While in the column I also replaced the broken key in buzzer switch with a NOS piece. I'll be out early in the garage tomorrow morning with my wiring diagram, meter and seeing what I can find.