I don't even know... what to use for the emulator.

[notolius]

just use usb bluetooth dongle to connect wiimote with your pc and pair it up via option--->configure wiimote setting in dolphin emulator, choose real wiimote in drop down option

For the keyboard, choose emulated wiimote and click configure, u'll c which buttons to use and u can change it or leave it by default, Mario Kart is a lot easier to me with keyboard and mouse