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Most people I've seen with lots of keys just used an excel spreadsheet to keep track. Have you tried that?

^Edit: Another option might be using a checklist/todo program this one todotxt seems like a good choice.
I made this little video showing how you could use it.

I've been using this system for a couple of years now for notes, reference items, etc, on personal and work computers. Same directory structure on all machines, even google drive/Dropbox.

http://plaintext-productivity.net

Todotxt.Net for task management:

http://benrhughes.github.io/todotxt.net/

VS Code for markdown/notes editing.