The Wico balltops cannot be removed unless you take a hacksaw to them.
Also, if the APAC is infact a gamepad emulator, it may not have actual keyboard key press functionality. I ran into that when I hooked up a USB KeyWiz from GGG. It did not detect any actual keyboard key presses. I opened up the game controllers icon from the Windows control panel and was able to detect game pad button presses.
That may be important to you if you plan to use any admin buttons on your CP or in you cabinet. You may need an additional PS/2 (keyboard emulator) to get ESC, TAB, ENTER, etc.
Or you could just keep a keyboard inside the cabinet for admin or use a wireless keyboard outside the cabinet.