@cubicgarden Thanks for this writeup. I've also started with documenting these things for me (not finished yet) and it gave me some additional insights.
@cubicgarden.com I think in the end a solution needs to be as easy as possible. So I go with text files like your readme files.
I have not finished the project but that was how far I came. The main text file is a map into my digital brain to other important files. One of them contains a list of all subscriptions.