Yes you can! Mac trackpads and keyboards are just USB (1?) devices!
If you have a dead MacBook (Pro/ Air) you’ll still be able to convert its KYBD and trackpad to a genuine and original (although a bit steampunk) Mac KYBD & trackpad array. Apple itself, nor other brands IMHO have no KYBDs combined with trackpads on the market, So, get original!
Excellent addition for an iMac, for example.
You’ll need a soldering iron & some tools, as well as a simple USB A cable to spare.
USB 2 connections are very simple: Common, +5V, Data+ and Data -. Just 4 soldering connections to do.
The easiest Apple model to recuperate from I find is the 2007 MBP Core2 Duo with the defective NVIDIA 8600 M GT in it.
To be had for free, mostly.
Unrepairable, but the KYBD & trackpad may be salvaged. Internal flatcable may be defective (another generic defect with this model), but this in no way defeats our purposes.
If you want a more capable trackpad, a more recent Mac wreck will do. I hope some other iFixit members will chip in with the USB board pinout.
As for the present: see these:
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