63 Keyboard Switch Tester with labeled keycaps $50. ... The keyboard switches are in the layout of 9 x 7 and feature DSA keycaps mounted in an acrylic base measuring 18.3 x 14.7 x 2.5 cm.

It was neat because of the customizable window in the corner of the keyboard. Now, imagine getting those same OLEDs for each key on your board. This would let you change your layout and label ...

It included a special "Keyboard" button that would swap the layout between QWERTY and Dvorak logically, but the physical keycaps would need to be re-arranged to match if you needed a label reference.