SAFE DEPOSIT BOXES ARE NOT SAFE. THEY OFTEN GET DRILLED. IF YOU MUST USE A SAFE DEPOSIT BOX KEEP A COLDCARD IN THERE RATHER THAN STEEL PLATE SO IT IS PROTECTED BY A PIN AT LEAST. OR USE A PASSPHRASE. OR USE MULTISIG. BUT IN ALL SITUATIONS ASSUME THE SAFE DEPOSIT BOX WILL BE COMPROMISED AND MITIGATE THAT RISK. AS FOR TRUST SETUP, I LIKE MULTISIG BEST. GIVES YOU A LOT OF FLEXIBILITY. EX: YOU HOLD TWO KEYS, HEIR HOLDS ONE, LAWYER HOLDS ONE - HEIR AND LAWYER WOULD HAVE TO COLLUDE TO SPEND FUNDS - IF BOTH LOSE KEYS YOU CAN STILL MOVE FUNDS.

I would use SEED XOR and keep one copy with a family member or at a second deposit box. Also male sure you put the steel plates in tamper evident bags; otherwise, you won’t know if the seed phrase has been compromised. If you want a KYC free option for multisig, nunchuk has a great product with inheritance planning that you can also manage through Sparrow if you like that interface better.

Suggestions on multisig? How about splitting the seed into two safe deposit boxes as different institutions?