I am thinking that possibly I might use the Arduino as a control head for the RPi. I can get a two line LCD panel with a series of buttons and that is enough to have a menu system. I could connect either via Ethernet or by USB serial.
As part of prep for this experiment, I went by the MicroCenter near me and purchased a two line serial LCD panel; complete with an Arduino processor to control it. I also picked up a joystick shield for the Arduino to add some controls to it.