The idea is great but I don't think that is necessary though, I think the owner himself needs to be aware of his status and have some kind of protection/ backup for his Bitcoin. That should and must be the right thing to do with everything especially with this field which involves crypto where you can lose all your assets because you lose your private key and have nothing to backup.
So it's like backing things up, the owner needs to point out the inheritance himself, let the wallets do the more important works.