If by some freak accident all 4 of us die at once (at a bachelor party or something), I trust my heirs' competency to find someone who can guide them through it. I specify more than 1 because while I trust all the technical advisers, shit like gambling addiction can happen that I don't know about.
In return, I'm written in to help with similar circumstances for them.
The hard part is setting this up, but now it's just an annual email.
Sorry, a bit morbid, I know. But something you‘ll have to think about nonetheless.
I wish more companies would think about that and solve this in some way. 1Password could for example print out some instructions and have a support number to call listed directly there for someone who finds this document.