You can give this a shot, if you just need something very barebones.
title: "$:/joe/stylesheets/plaintext-tasks"
tags: "$:/tags/Stylesheet"
<!-- Meta
Ref: https://www.compart.com/en/unicode/category/So
Other: ▧▨ 🈩⧄⛋🞔☒⮽🗹☐
-->
li.done {
list-style-type: "☒ ";
text-decoration: line-through;
text-decoration-color: <<colour dirty-indicator>>;
}
li.defer {
list-style-type: "▨ ";
color: <<colour muted-foreground>>;
}
li.doing {
list-style-type: "⧄ ";
}
li.doing::marker {
font-size: 1.13em;
}
li.todo {
list-style-type: "☐ ";
}
li.br {
list-style-type: "";
}
"title": "2025-011-11 Tasks"
"tags": "Tasks"
*.todo task todo
*.doing task indev
*.done completed task
I borrowed this and modified it from telumire awhile back from his TW, Minimal CSS, I recommend it!
Edit: Ah, apologies, I read the rest of your post, and I believe this may be a bit too basic 
Well, unless you wanted to copy/paste a pre-made tiddler once a week with the text:
!!! Monday
*.todo
!!! Tuesday
*.todo
(etc.)