I have looking into that control arm myself, until I spoke with Kevin from Kmac and I think that the lateral link it would be easier to modify and the part itself it's almost half the price also. The adjustable link and the existing toe adjustment, would pull in the wheel.
The lateral link, is around $44 shipped and the control arm is more then $80 shipped.
The Kmac solution is not going to happen, because Mazda made the decision to mold the rubber bushing into the "tube", instead of using a bushing. If we had bushing, then Kmac would have given me the bushing, that would have been pressed into the original bushing's place.Another problem is, that the tube's interior diameter(where the rubber is) is not really round. I have measured around .012 difference at 90 degree.
The adjustable lateral link, it's to much for me($450 shipped).
I'm thinking of ordering a lateral link, which I will have to cut out a portion in the middle and I need to see the thickness of the tube's wall thickness. Dependent on that measurement, I will have to see what I have to do next. Definitely I will have to machine out of a hex material a left and right thread for adjustability, make these threads in the tubes. If the tube's wall thickness is not thick enough, then I will have to cut some tube material and pull over the existing tubes and weld them there at a good welding shop.
Another option it would be, if we could put an adjustable bushing in that control arm. I'm not familiar with these bushings. I believe that the bracket holding these control arm, should have some kind of part welded in to hold the eccentric washers.