On modern aircraft the majotity of the noise is created by interference of slipstream around gear/flaps
I think I'm about to ask something numbingly stupid, but that's what I'm here for.
If gear noise is that noticeable, wouldn't it be reasonable to consider aerodynamically-shaped strut components in the design phase? Having worked in a different field with drag (simplifying, drag = noise), relatively small engineering changes can have large positive effects.