This Dvorak inseert is an interesting doohickey. Don't think I'll be buying one, but if I were a firearms instructor, training new shooters, it might be worth having one of these.
Here's a video that shows the Dvorak system in use:
https://www.youtube.com/watch?v=Ewl0iOSm9_g
And here's an article that mentions prices from a couple of years ago:
https://www.recoilweb.com/enhanced-d...ak-133767.html