Just lower the car 1.5 inches from stock and the fronts will have a range of about -2 to -5, the a range of about -3 to -5.5. Don't quote me on the max negative end of the range, but the point is that you will be able to get -3 at both ends with stock adjusters.
If for some reason you won't lower it that much, CT has offset front ball joint bushings to shift the adjustment range more negative (or positive installed 180 out). So, same total adjustment amount but starting from a different center point. There are no such parts for the rear, but bushings similar to the fronts may be feasible.