you need to have a dead man's switch: a single txn that sweeps your entire cold storage into a new one in case your seeds are confiscated. this txn shouldn't be that secured as long as it's not stored along with the new keys

the new keys should be stored separate from wherever the original keys might be confiscated, whether it's your home or a hardware wallet taken at an airport, etc. the dead man's switch txn should be able to broadcast from wherever, whenever, by whomever

how to design this kind of safety mechanism is up to you 

 Smart