I broke down and bough Analog[0] for something like this. The idea of paying so much for some index cards and a block of wood was a bit crazy, but the cards were the exact design I'd want. Looking around all over, I wasn't able to find anything else quite like it. If feels like holding the Apple Reminders app on paper. The wooden holder I thought was a gimmick, but I got it anyway... I actually kind of like it. Similar to your app in the menu bar, it's always there on my desk to bring me back to the task at hand. The whole thing reminds me a little of how I did GTD back in the day, but with a lot less rules to follow.

Funny enough, Analog has this idea of Today, Next, and Someday... which were they exact 3 lists I had finally settled on in Reminders after realizing every other system I looked at was too complex. So the move was pretty seamless. For now I'm still keeping my Next and Someday lists in Reminders.

[0] https://ugmonk.com/pages/analog