>The part I struggle with most, is how/where to store these & Authy/Google Authenticator tokens in a manner that they can be delivered to specific people in the case of my death without decreasing security.
I recommend reading about Shamir Secret Sharing. You could have a system setup such that (for example) you give 16 friends each a code and 9 of your 16 trusted friends all have to work together in order to get the original secret.
Something I've often wondered about...