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NemoWuMing
Perhaps too much harassment in the places you have looked at?
Not sure what books you are talking about, but there is no Pinyin interspersed in mine, and the hsk levels are clearly indicated, so we are probably talking about different books.
For regular to-do lists (like a shopping list) I use Google keep, and it has a widget that displays any list you want on the home screen. It also lets you share lists with others.
For tasks that need a date and time, I create tasks in Google calendar and they are automatically listed on the calendar widget
MacBook is light and functional. If you want even lighter, a foldable phone like the Pixel 9 Pro Fold might do the trick. That way, you only have one device to lug around, instead of carrying both a laptop and a phone.
Mayonnaise, as explained here:
https://theonion.com/new-high-viscosity-mayonnaise-to-aid-in-american-swallo-1819564964/