One of my students is learning to produce braille by using the Mountbatten. His little fingers trip over themselves and his fingers have difficulty staying in place. So I made a tactile representation of the keys of the device. We practice first on the paper before moving on to the device. We practice a couple times on the device before turning it on.
It’s still too early to say how effective it is, but his errors have gone down in the two times we’ve used this method.