I've seen a few of those tools that send passwords periodically (unless you stop it) to designated people. Like you said, that's subject to abuse.
I feel like there needs to be a crypto solution, like a smart contract of some kind that is trustless. The good thing about Hive is the wallet is public anyway, so what is contained there is clear. The information is also out there for would be claimants to educate themselves on the value of the token and how to cash it out, or continue staking, or whatever. The issue is how to grant access.
If only Skype worked in heaven (or hell) sigh.
There are cryptographic protocols for key splitting, but we have to make it easy for the right people to get access when needed. Maybe one of our smart developers can come up with something. Of course you can go old-school with a flash drive or printout in a safe. I'll give it some more thought.
There's a potential millionaire making tool there somewhere for a clever developer :)