That's really rare, yet, not unheard of.Alright so the car is running again. Thanks for all the suggestions! I didn’t read them all in time but it may help someone else.
It ended up being the ignition computer that failed. Unfortunately I can’t be helpful in how to diagnose this since I just started swapping parts with known good ones until the car started.
A reminder that it’s good to keep at least one spare of every electronic part of an old car if you need to depend on it.