You should have absolutely no trouble getting enough horizontal for that set-up..........look at the sight, you will see a small 2 hole spacer bar that is used in conjunction with the 2 screws that hold the aperture to the sight bar.
Take that assembly apart and then take that spacer bar and move it to the pin side of the bracket....reassemble the entire deal. This will take the aperture to the left the same amount of distance as the thickness of that spacer.
You'll have more than enough windage at that point.


Edit:
You know what?.........I'm going from memory here so it's a little foggy........that spacer bar might actually be located to the inside of the aperture frame rather than the backside to start with? If so just flip flop the location of the bar and the aperture to get the left windage.

It'll be very obvious when you see it I just can't remember the starting position of the stupid thing.