The Raphnet Wii Classic Controller to USB is the real del. It's seriously as good as a Wired Xbox 360 guitar. Legitimately buy one of these if you have a Wii Guitar.
Amazon.com: Raphnet-tech V3 Wii Adapter, Shipping from The United States, for use with CloneHero peripherals|, (ADAP-1XWUSBMOTE_V3) : Video Games
raphnet. - Gamecube controller to Wiimote adapter
Found my old wireless wii guitar. do i just need a raphnet adapter to get this workin in pc? will raphnet work for ps3? : r/GuitarHero