Im Just asking because hid to vpad is allowed to do this. Not only for Splatoon but for Other games like Deus Ex or Tokyo Mirage. My left joystick is a bit Broken and its a pain playing with it.
So I'm assuming in your SysDRV confing (the homebrew nro) you have the RTSP mode right? I tried all you have said but I had no luck... the only mode working for me is TCP bridge...