If you want to make sure the data's never recoverable, just use a password in addition to your hardware keys to unlock your computers. So when you die it's completely gone forever. No one will ever decrypt it
If you want to make sure people can open your archives after your death, but only after your death, you could look at bit warden's emergency release functionality.
You could also implement Shamir's secret sharing, on some print out paper, so that two or more people would be required to collude to unlock your secrets. And if they're trusted people in different jurisdictions, you know they'll only do that after you're dead. Then they could use that to get to your digital legacy, your crypto wallets, your decryption keys etc. https://github.com/cyphar/paperback