Here's mine:
https://www.stavros.io/posts/keyyyyyyyys/
Wildly impractical, but super easy to build.
https://www.stavros.io/posts/keyyyyyyyys/
Wildly impractical, but super easy to build.
Replacing the thumb button with some kind of clicky D-pad (D-pad mounted on a microswitch) would be a somewhat easy way to add more buttons. (my first thought was going with two per finger by adding one around the side or to a strap on the outside of your fingers)