When they rolled out Media Center, they had their dongle, their remote (the one that you have mapped in the choices of pre-programmed remotes) and a full sized wireless keyboard, that included all of the function keys on their remote, but that added a nipple mouse control on the upper right.
Here's an Amazon link for the keyboard: https://www.amazon.com/Microsoft-Remote-Keyboard-Windows-ZV1-00004/dp/B000AOAAN8