There is also the Lenovo Trackpoint Keyboard II if you want something smaller.

Okay, wow. I was looking for something like this for a long time. I'm going to pick one up immediately.

Is there an ergonomic keyboard you recommend? I used to buy Msft Sculpt but want one that is compatible with macOS.

Looks very interesting, not sure I love the layout of the Home/End/Del but I do love how narrow this would be on your desk