[rezeroed]

We need keyboards with digital keys, not printed, so we can change the layouts at the click of a button.

[joemccall86]

I recalled https://en.wikipedia.org/wiki/Optimus_Maximus_keyboard from years ago. It looks like the successor uses an LCD screen: http://www.artlebedev.com/optimus/popularis/.

[rezeroed]

Bingo.

[flyingfences]

Or just use blank keycaps... the legends shouldn't matter because you shouldn't be looking down at the board while you type.

[rezeroed]

For learning and trying out new layouts.

[flyingfences]

Still, you shouldn't be looking down. In addition to taking your eyes off the screen, it also builds a dependence on seeing your finger positions instead of building muscle memory. The recommended method (if you aren't willing to go cold-turkey trial-and-error) is to print out a map of the layout and tape it on the _top_ of your monitor for a few days.