The keyboard works with the connector, but I bet the connector is wired up to one of the external USB sockets, so you can unplug their keyboard from the connector then plug your own full-size keyboard into the USB socket instead.

Here's my interpretation of the USB ports:

Four internal ports. One is reserved for WiFi. One is reserved for Bluetooth. Two are free.

Three external USB ports. One is reserved for the keyboard. Two are free (one mini, one regular-size).

Overall, this looks like a really nice device for travelling. A second SD socket would have been nice, but nevermind.

Regards,
Roger