I too wish there were more out of the box solutions for these. I also wish more keyboards separated the keypad from the main keyboard. I like to stay centered in front of the monitor, which means necessarily the number pad makes the whole thing asymmetrical and knocks into the mouse (I have a very narrow desk).

I'm surprised they're not more common, because many of my programmer friends also prefer mechanical keyboards. At that point latency seems irrelevant? It doesn't appear mechanical keyboards are intrinsically less suited to being wireless...