Maybe I can add an option: have you seen "
split mnemonic cards"? To me, this is a lot more intuitive than multisig (although I've never used it in practice).
Example:
Card 1: tiny XXXX fetch dash hint XXXX minute XXXX XXXX XXXX belt ship XXXX XXXX system XXXX globe engine type country chief filter muscle tray
Card 2: tiny knock XXXX dash hint ranch XXXX job inch chief XXXX XXXX manual liar system have XXXX XXXX type country chief XXXX XXXX tray
Card 3: XXXX knock fetch XXXX XXXX ranch minute job inch chief belt ship manual liar XXXX have globe engine XXXX XXXX XXXX filter muscle XXXX
This accomplishes exactly what you want: you need 2-of-3 locations to restore the private key, and if someone gets their hand on one share, I don't think brute-forcing 8 missing words is viable any time soon.
Seed splitting is a bad idea according to Antonopoulos.
It is hard if you don't have full mnemonic seed to recover your wallet later and it's possible issue with seed splitting.