Very nice project but i think is a good idea to use all free pins of the Arduino.

My Arduino code: https://github.com/themaire/StreamDeck

Keycaps printed with a 0.2mm nozzle (very necessery).

So i added a i2C OLED screen SSD1306, 4 UV LEDs triggered by a hidden capacitive button. UV LEDs because it activate very good the phosphorescent PLA ^^.

In the script, the #5 button do a nice ALT-TAB shortcut.

Button #8 is for the mic mute function. A 3mm red LED is under the keycap turned on when 'mute' is activated.

From France, very good job Dave!