RGB Backlight? Check. Powerful open-source firmware? Check. Graphical configurator? Check. This keyboard has it all — 47 keys is all you are going to need.
This compact keyboard impressed me as a possible good condidate for me or others who use a mouthstick or others who have a limited field of movement. Would love to try it someday.
Source: Planck EZ: A Powerful, Backlit, Open-Source, 40% Mechanical Keyboard | Planck EZ