How is it really that different than cleaning any other set of wheels on the ZL1? Any wheel you buy will get the same amount of brake dust showered onto it. The correct process for cleaning a wheel and tire requires the cleaning of the tire, caliper, barrel, lugs/brake hat/hub, and face of the wheel. No matter what the design of the wheel is, you'll still have all of those steps. The only step that gets shortened by a 5 spoke wheel is the last one; the face of the wheel. So what, maybe it takes 30 seconds instead of 1 minute. Is that worth it?
If it's purely design, preference is preference, so go ahead and purchase any set of wheels. But if it's a cleaning issue, make sure you're using the right products and processes. I can get each wheel spotless in 2-3 minutes per wheel. I use mostly Adam's products but almost any brand/store offers similar stuff.