Hi, As you can see in my profile, I have many experiences in circuit design and PCB layout.
I developed a PCB board which similar to yours. my board uses MCU to control RGB LED via led driver IC, the LED color can be changed by an IR remote. I also power my board by +12V VCC, and my board dimension is 3x2 mm.
It will be nice if I can help you with your project. We will discuss more detail if you choose me.
for example: how many inputs do you use? how many outputs do you want?
I can also give you some advice to choose MCU, LED type and IR receiver for your project if you need.
Finally, I can do your project within 2 days.