What’s weird is that the mechanics of it are so simple, I could probably make one out of scraps currently sitting in the garage. I’m seriously tempted to make one out of K’nex or Legos or something and post it online.
Instead of a big wheel, you can at least start with a drop spindle. I saw one demonstrated at Rainbow Fleece Farm and it was pretty cool!
https://joyofhandspinning.com/spinning-yarn-with-a-drop-spindle/