I have tried using the pocketop keyboard with my C750 and it is hopelessly cumbersome due to the IR port being on the back of the C750.
You can get it to work under the X11 ROM using the python pocketop driver and the kbdsim.o module. Be sure to create /dev/kbdsim first using mknod. But be warned that the keymap is a little messed up and the driver seems to go crazy once in a while, requiring you to stop and restart the driver.