Converting Wireless PS3 Rock Band Guitar to Wired USB?

I'm a bit late to the Rock Band party (okay, *a lot*), so I when I saw a PS3 Rock Band wireless guitar at a Goodwill store, I excitedly bought it, but when I got it back home, I was disappointed to find that it does not use the PS3's Bluetooth after doing some research, and actually requires a special wireless RF dongle that I did not receive with the guitar. Unfortunately, these things cost around 30 bucks on their own.

So, I've been wondering if it's possible to make this wireless guitar use a USB cable instead (perhaps to just work with the PC). Is something like this even possible without swapping the internals altogether? Thank you in advance.

It's possible to wire the buttons to an Arduino and use it as a USB input device to a PC through the Arduino. You should be able to find plenty of arduino projects that use the guitar hero and rock ban guitars.