Me too, I find Tiddlywiki perfect for this kind of use! You may have seen it, but it is recently made a php script that let you save directly to your server and create a public version where private tiddlers are removed or censored [0]. That way you only need to manage a single file. But it sounds as you have found a good way of doing it already:)

[0] https://groups.google.com/g/tiddlywiki/c/GRkskZRzj_o