there is an issue with that, first those emulators do that bacause they only need to anticipate for CC,GC, and the wiimote + nunchuck, with nintendont you got a huge problem, hid controllers, they can have the buttons they want and on the position they want, for instance you can connect a hid keyboard and have 50 buttons for input, so there is no way for nintendont to know which buttom is what, becuase hid controllers all had their custom number of buttons at will, unlike wii64 and wiisx where they give you 3 designs for you to change the buttom comands, on nintendont the hids can be all shapes and random number of buttoms.
See the problem now?