Google actually provides this service: https://myaccount.google.com/inactive?pli=1

At this point I've moved almost everything off Google and basically now only use my Gmail account for logins on websites I don't want to give my real email address to and to keep Inactive Account Manager setup to send the necessary info to get into my 1Password account to my brother if I die.

I have a will setup with all my financial details and have set beneficiaries everywhere but this feels like a good backup in case I forget to update it with something or my family has trouble gaining access using other means.