I ended up writing code that I am pretty damn proud of! The original code was really simple, but I've added code to configure the device, which just has a rotary controller with a button...
When you power it on it will check if you are holding down the button, then go into config mode so you can set the channel and then saves it to EEPROM.
There's twice as much code now, but it's still pretty minimal...
(And I though of a way to make it even more versatile as well!)
