Here is a thread about doing it on a voyager there is source code in there somewhere:
https://www.mobileread.com/forums/sh...d.php?t=279209
But let me ask you, if you turn off the touch screen, how are you expecting to turn it back on? The paperwhite doesn't have any other buttons,
There is another thread about using keyboard and mouse, also source code throughout the thread from various people, this could be a way to re-enable the touch scren, I'm not sure how it works on the voyage 'Intocable' thread.
"KindleLazy"
https://www.mobileread.com/forums/sh...d.php?t=278776
"USB OTG Support"
https://www.mobileread.com/forums/sh...d.php?t=276501
Thinking outside the box, another option would be to buy a case that has wider bezels?