It could be a good in it with a model without display and with knaper and RGB LEDs, instead of and to minimize the number of I / O pins you can use a PCF8574 is an I ² C bus to LEDs
I can self use one that has display, 3 buttons, Ethernet and RS485 (terminal) and have the opportunity to self add a TO-220 regulator, for I have 24V DC to another controller to run together