Passed SMOG today. Drove it 100 miles over the past few days with no codes.
What it wasn't for sure: CPS, coils, timing chain, catalytic converters, battery, alternator, or PCM.
Conclusion: I suspect it was an electrical wiring gremlin. Once I ran through the entire harness from sensors to PCM (removing covers and looking for breaks, burns, frays etc.) tested signals on both ends, and put everything back together I had no codes. This was after firing the parts cannon regarding the misfire and O2 sensor heater codes. (New plugs, injectors, upstream O2 sensors)
I'll update if it comes back and I can pinpoint it to a specific area.