Neat idea!
One possible approach: I have a QuickAdd (community plugin) macro that lets me press a keyboard shortcut and move the line I’m on to a specific section in my daily note. I have very similar one tied to a different keyboard shortcut that will open up the Quick Switcher for me to select a file and then move the line I’m on to the same pre-specified section in that note instead. (I use this for sending to other day’s notes. It would definitely break if I selected a file that didn’t have the section name that the macro sends it to.) This approach works for me because I like the idea that my files will not change unless I explicitly command them to (via the keyboard shortcut). If you’d prefer to type a tag to trigger the move I have no idea how to do that part.
I hope other folks can share their approaches and that between all of them you’ll find something that sounds good!