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The Unicomp EnduraPro is a Model M with a trackpoint. Unicomp bought the design, and IIRC the molds, for the Model M from IBM and/or Lenovo when they got rid of them.

https://www.pckeyboard.com/page/category/EnduraPro

A word of warning - I haven't found the trackpoint on it to be useful like it was on a thinkpad. It's too jumpy at short distances and too slow at long distances. I've since started using a Logitech M570 instead, as it reminds me of the trackball I used to like before I had a Thinkpad.

https://ultimatehackingkeyboard.com/

Mechanical and split ergonomics.

Has built in Mouse capability using the keys. They’re also working on attachable touchpad, trackball, and trackpoint (just like a thinkpad).

If you are able to make a mechanical keyboard (like the person in the linked story is), couldn't you include a trackpoint and buttons?

Yes, here's an example with a build guide: https://github.com/alonswartz/trackpoint/blob/master/README....