Fellas, I repeat it is very very difficult to capture the concaveness(sp) of the wheels in still photos. Every picture I have seen does not capture the same concaveness that your actual eyes see the wheels when in person. Even the HRE's on my former M3 are more concave in person than in any pictures that I have seen.
That being said, HRE can make a set of custom wheels specific to your request. However, keep in mind that they will only change the wheels to be within the safety and structural standards to maintain the integrity of the wheel to be safe and road worthy. Be careful of other manufacturers that may make custom wheels and compromise the integrity and safety of the wheel.
Just my two cents!