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If it were me, I’d punch the Meter service circuit through the bottom left of the breaker box into a fused disconnect switch box hanging on the left side. Run the switched source back into the breaker box. Agree, I’d run breaker protected four wire from this box to the new sub panel.
NEW sub panel needs local ground rod too.
HOWEVER,,, I wouldn’t touch a thing without knowing the service to the meter. I also don’t like the size of what I think is the service neutral.
Or as has been said, nuclear option is replacing the guts of the panel with new tech. In any case,,, I’d put this on the homeowner for responsibility.
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Harmlessly passing gas in the grassland away;
Only dimly aware of a certain smell in the air
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