For AILERONS in a swept wing, you are correct. You want the pushrod at 90-degrees to the hinge line. That makes things go together without any twisting of the aileron horn. Now, if you use a ball link at the control horn and/or servo, then you get rid of the twisting action. In all cases, simplest is best, and a direct pushrod with no angles or bends is always the best way to go.