I've got ZKW's and a Dinan CAI
As one who bought ZKW's, added the Kamei eyebrows, and then decided to add the CAI....it wasn't fun. Removing a headlight after installing the eyebrows is a royal pan in the butt! And squezing it all back in there isn't any fun either, but it's doable. It's a very tight fit, but it all goes back together.
BTW, there are two things that must be done to achieve this. One, you can't use the heat shield(or whatever they call it), there is just no possible way it will fit.
Second, you will have to relocate your horn. On tuesday, I plan on fabricating a bracket to relocate them, right now they are kinda rigged, bolted to my cruise control module (yes I know, it looks horrible) Here are a few pics...