Also https://g3rv4.com/2022/04/using-shamir-secret-sharing which includes a link to an easy-to-use SSS tool that can output shards as QR codes.

I am picturing a room full of non-programmers staring at all these documents, codes and Docker commands and saying “Well, Greg was obviously crazy. Instead of leaving any of his passwords, he just left pages of gibberish. I guess we’ll never be able to access anything.”

Me too, but then I realise that one should include at least a few tech savvy friends - or references to good coworkers or similar which these friends could contact.