Pair Wii U gamepad without watching TV

[Coll147]

Hello, it happens to me that my Wii U has a damaged video output, and I wanted to ask if it were possible to use the gamepad link function and have the console give me a pre-established key, that I already know so that I can enter the key into the gamepad without see the screen. Or maybe the console gives me the code, for example by flashing the power light or the disk light.
Well I hope there is some option for my case, thank you

[BDMCGaming]

This does theoretically seem, because if I'm right, the power led is just an RGB light. We can just associate a certain color with the symbol. That may require a lot of coding though, which I'm not good at. We can only hope for someone that knows how to do it.