Use it in friction mode. Will not work/will work very poorly in indexed mode.
The limits of derailleur movement are set at the derailleur using the end point adjustment screws, not the shifter. If your derailleur shifts into the spokes or ontot he axle that is a derailleur adjustment problem, not a shifter adjustment problem. In fact, I was taught to, and still do to this day, adjust end-point screws with no cable attached.