These guys have launched a wildly succesfull kickstarter to produce what is basically a large touchpad. You can print 3D overlays which magnetically lock into place. Programming new overlays shouldn’t be too tough. It’s sensitive enough to detect paint brushes. Now let’s hope it can be a keyboard with the pinch and zoom and multifinger gestures the guys at Fingerworks invented before it was bought up (and then commercially killed) by Apple!