Not sure why a single person has not answered. I guess not many people use black. I was able to get a 6 button keypad in black but have not found a black wall plate. I've been eyeballing something from Lutron and wonder if that will work?
The SwitchLinc wall switches are of a decorator style. A wall plate would probably work. The proprietary paddle assembly on the SwitchLinc. Would probably not work with a different manufacturers accessories.