There are two split-keyboards made by Ultimate Hacking Keyboard [1], UHK 60 and UHK 80, that have an optional trackpoint or trackball module. They're not cheap,

There are two split-keyboards made by Ultimate Hacking Keyboard [1], UHK 60 and UHK 80, that have an optional trackpoint or trackball module. They're not cheap, though. [1]: https://uhk.io/ https://uhk.io/