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Would a touchpad work? If girder can (or by any other means) block the mouse control from the touchpad, you can maybe set it up to take actions according to the x y position of your finger when you tap it.
For instance, imagine the touchpad separated into four quadrants. You could then apply a mask which covers all but the four shapes/icons of the buttons.
Not sure if it's plausible, just throwing it out there.
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