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That's quite close to what the IBM/Lenovo Trackpoint offers.

No, it's not a trackball (it operates by pressure rather than rolling), but the navigation is quite precise, and leaves both hands on the keyboard and home-row keys.

I've reached the point I'd like that for a desktop keyboard as well as laptop.

> I'd like [the IBM/Lenovo Trackpoint] for a desktop keyboard as well as laptop.

I think such things are commercially available. At least I'm fairly sure I saw them advertised on the Internet, not many years ago.

The Ultimate Hackers Keyboard has exactly that as a module you can attach to the keyboard.

It does it does! Very tempted.

Not sure what cleave keyboard is, but you can stick a tint pimoroni trackball on any qmk keyboard microcontroller.