Hi Thunderchild, unfortunately, from an email response I received from gp32z, the chatboard connector isn't the same as the one on the gp2x so a physical adaptor must be made to connect the chatboard to the gp2x. I was hoping otherwise myself since the chatboard is a perfect alternative for key input and is super tiny too.
Hopefully a smaller usb self-powered keyboard is available soon for the gp2x.