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I would suggest digging into how the USB adaptors for the Logitech shifter work (like this one) to make a kind of "reverse design". You would also need to bypass the current USB controller of the shifter to hardwire the buttons to the Arduino, as AFAIK you can't connect a USB device to the Arduino. You still may need a USB cable to power the Arduino so you may end up with two cables attached to the shifter.
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