I've designed a new PCB to improve some features:
1.- Added 2 gaps for mechanical support for some switches
2.- Connector pads are now through hole, are smaller too, but is necessary to add the to gaps described before.
3.- now you can mount the sk6812 4020 twisted 180º too, so it swap the direction pin:
Now there isn't DIN or DOUT silkscreen to indicate the data direction, when you solder the led you set de direction pin too.