Looking through the list of 3rd party implementations, I came across the Digital Ocean devices (not the cloud provider; the original company was defunct by the late 1990s) - the Newton came out just a few years before I really started getting into tech (I was a poor high school kid at the time), so not terribly familiar with a lot of companies in that space. I do remember seeing the Newton being used in the Steven Seagal movie, Under Siege 2, which came out in 1995.
https://apple.fandom.com/wiki/Digital_Ocean_Tarpon