A safety deposit box meets that need. It’s not immune from a warrant but if I understand your desire breaking up a pass phrase into pieces and storing across different deposit boxes and some at home is probably what you want but they can all be raided potentially.
Discussion
Yea, I suppose so. I was thinking of something I could pay for in Bitcoin and was specifically for holding fractions of a priv key so it didn’t need the security of safety deposit boxes. Having said that, I don’t even know how safe those are.