True, it's not a good solution and there is Subvocal Recognition (SVR) that detects electrical signals in the neck or jaw using pads. Hall effect keyboards are pretty good in terms of sensitivity I find.

Lip reading by HAL was also a disaster for Frank Poole.

Maybe a large screen that can easily be flipped vertical/horizontal would work well. People already do it with the their smartphones - why not stationary screens? Have the OS detect when it happens so it can make any predetermined layout changes. Maybe have it rotate using a small motor? Cable connections into a base unit to avoid entanglement.

In terms of screens - I think two volume dials to adjust for brightness and another one for blue-light would be ideal. It should be super easy to do at a hardware level. On 24 hour programs if really pedantic. Maybe an external "volume dial" pad that can be plugged into a USB-C would be suffice and it could have a light and movement sensor as well to take a computer out of (and into) suspend and set the desired brightness according to the environment.

There are rechargeable closet lights that already have movement and light sensors - just need to adapt it to a screen.