This is a cool problem. Never looked into it any further but there is some proof of concept code out in the wild about this. "Social key recovery" https://vita

This is a cool problem. Never looked into it any further but there is some proof of concept code out in the wild about this. "Social key recovery" https://vitalik.ca/general/2021/01/11/recovery.html https://vitalik.ca/general/2021/01/11/recovery.html