It sounds like you haven't read about how it works. The system doesn't require the heir to verify their identity - you have already shared an encrypted form of your key with them, they just have to trigger the unlock timer to access the key they already have along with a signature from Casa's recovery key. It's basically just a timeout system that unlocks access to the key material that has already been distributed.
I have read. My concern is 'why third party?'
I have a simpler solution. Write up everything in a diary, keep it up in a safe place, write your will and enjoy.
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My brain finished your sentence before I finished reading it. It had replaced enjoy with die. Not sure what this says about me~~
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