Just use a password manager and set a switch up there

Then (if you have a well structured password safe) you also give whoever you choose to give it to information about your bank accounts or insurance numbers that relatives might not be aware of

Going through all the books to figure out what's relevant and what you have to care for is a huge pain.

I don't know if I'd want my lawyer to spend hours (that I'd have to pay for) in order to get access to accounts that might be relevant.

Who knows what's relevant in the end?

Sure if you're saving the logins for porn inside your manager, too, then it's going to be awkward but so is the old-school porn-box under the bed or the toys-drawer