One solution to this could be to create a notepad where you can keep information about your funds that one person can access. In this case, that node will definitely be important and it is important to keep a trusted family member informed and educated on the use of those assets.
Especially educate your heirs and make arrangements so that they have access to your assets in the event of your disaster. In this case, if your heirs are not trustworthy, you can lose your assets. So you need to choose someone you can trust and who will repay your trust. I will never see the wealth I have accumulated throughout my life buried with me.
Adding to your strategy, you can write your node on a physical paper and keep it in the bank and inform your family members so that in your absence, your designated person can receive it and use it to recover the funds. In this case, educate your successor enough and make the funds usable.I will never trust any of my relatives or family members with the amount of my wealth or about my assets, as long as I am healthy or alive. Because it is not wise to trust anyone blindly in this world and no one should share secrets, especially in financial matters where a lot of money is involved.
I totally agree with you on the part been highlighted because it will serve as a document containing all your life time fortunes (assets /investment) in life so that if eventually you aren't there any more, someone dear or very close to you can still get access to your funds to finance any financial challenges that might surface.