Yes, the sovereignty is the same. I have been thinking a lot about the "Proof of Life" aspect. Perhaps there is a way in safebox to either create an auth/attestation that can only be shared in person like nfc tap that be used remotely to verify it is the person.

meet with family
create proof of life in safebox
family opens safebox
everyone taps nfc
verify family
family can send "proof of life" request remotely
confirm "proof of life" remotely