Apple sells an external trackpad. But AFAIK it requires the computer to have Bluetooth. Not sure how well it works with a non-apple os, though.
I suspect it does not work well outside Apple world. And that's kind of the thing with "I want Apple hardware but with Linux software": Software is actually important in the user experience with the hardware.
The Apple Magic TrackPad works well on Linux, both via Bluetooth and USB-C. I used one for a few years.
I suspect it does not work well outside Apple world. And that's kind of the thing with "I want Apple hardware but with Linux software": Software is actually important in the user experience with the hardware.