Just remove the rest of the keycaps using a keycap puller. Then open the keyboard (3 screws on the back, and 4 tabs along both the front and back edges) and desolder the rest of the switches. Remove the Costar stabilizers by squeezing the black insert in the plate, and pulling them out. Throw away the keycaps, PCB, metal switch plate, and plastic case. What remains are the only things of value from this keyboard. You can sell the switches and/or stabilizers, or use them for a DIY keyboard build.