Only forward thinking users with gigantic imaginations would ever come up with ideas like this. The manufactures just have too much at stake go out on a limb and create a product like the Korg Kaosilator guitar. Vestax and the controller one was an interesting exception, one which never did well commercially but was a remarkable achievement in creativity.
Instead of coming from Korg, this next level toy interface comes from a user named James Haskin who has written a how to tutorial on instructables.com Check out his video bellow where he shows the machine in action.