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This feels like a weaker version of GRC’s Off The Grid system. https://www.grc.com/offthegrid.htm
It doesn’t require you to remember something different per website. It’s designed so that you can turn any site name (E.g. Amazon) into a secure password which is unique to you. If you really need a completely offline solution, I don’t think it gets too much better than that.
I’ve never really had a use case for it myself. I’m happy using Bitwarden at present. It’s certainly a fun read and a good solution for anyone in need of a completely offline solution.
I really like how easy it is to customise it so that even if someone got a copy of your square, they wouldn’t necessarily be able to get your passwords. Changing your starting row or column or adding a few characters at the start of the domain will completely change the output. I’d imagine you’d need both the square and multiple passwords to even attempt to brute force a solution back out of it.