Need More Buttons

Hi all,I have the CH Products Flight Sim Yoke USB and Rudder Pedals USB.The yoke has only so many buttons and I would like to have a few more to replace various keystrokes. I've thought of getting the CH Pro Throttle Quadrant just for the additional buttons, but that would be an expensive way to go for me. I've also considered a relatively inexpensive joystick just for the buttons, but I wonder if inadverdent slight rotation of the stick might interfere with rudder inputs from the pedals.Any suggestions would be appreciated, including specific hardware recommendations.Thanks,Sandy