A wired desktop replacement keyboard, correctly labeled for both MacOS and Windows in relevant ISO 9995 format. Slim or full height, aluminum or not. The target market is primarily any Mac system that also runs Windows via Bootcamp, virtualization (Parallels or Fusion), or Microsoft Remote Desktop.
It should have the special function keys, eject, volume, brightness, etc. for macos and driver software that enables the analogous functions in Windows. Proper labeling and function of the Command / Windows keys, Alt and AltGr for language support. One or two additional USB ports for mouse and tablet/pen input. And a numeric keypad.
Apple has left plenty of room with the wireless half a keyboard @ $179 for anybody to do a lot better for a lot less. It is a useless annoyance to have to stock a bunch of batteries and have devices pairing haphazardly around the offices when a simple cable worked.
Function first before looks.