Can confirm the Mario Kart 64 + mupen64plus + Accelemymote = win.
Forward and back don't actually do anything on the joystick in Mario Kart, do they? Is it possible to map those to accelerate/brake in the config file? That combined with proximity sensor for fire button would leave only jump uncovered for playing with keyboard closed.
Note that this is only a good option for people with no friends, because receiving a SMS or IM notification makes a big mess of emulation smoothness.
super smash brothers-60% charas have no eyes
Hope this helps!