Yes, the 6 arm "star" shaped servo arm/wheel (output piece that screws onto the top of the servo output shaft) will end up looking like a very wide V when the clippng is done. The single missing arm location and the center of the 3 other missing arm locations will be aligned straight fore and aft. The 2 remaining arms will each be 30 deg forward of being parallel with the LE of the wing. (360/6 = 60 deg separation of arms. The space between 2 arms would be parallel wth the LE if you put the arm/wheel on the servo, then clip the unwanted arms off.)

You may not need to get a longer arm/wheel... The little white plastic pieces the clevices attach to can be screwed down closer to the wing on the torque rod. Screw both down the same amount SLOWLY making the change. You can go appx 4 turns each side the first try. The shorter distance from the pushrod connection to the hingeline will make the ailern mve more for the same amount of pushrod movement.

Only change ONE thing at a time! Don't swap the straight arm for the angled one AND change the torque rod connection at the same time. Fly it a couple of times between changes.

When you change arms... try for the same amount of upward defletion with the new arm as was obtained with the old one. (It won't be exact... a little more is OK.) Downward movement will be reduced! You will need appx 1/4 inch longer pushrods, or the ailerons will be drooped significantly at neutral.