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arduino-thinkpadkb-usb
Discontinued Using an Arduino Micro as a USB adapter for ThinkPad T60 keyboard with TrackPoint support. Supports different keyboards from the ThinkPad family that shares the same receptacle as T60.
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void_switch
3D printable magnetic separation contactless key switch and stabilizers (OpenSCAD files)
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And you also probably know that it is also possible to build one yourself: https://github.com/rampadc/arduino-thinkpadkb-usb
As far as I know the "other times this has been tried" all have had individual displays (and controllers) in each key. The difference being that here there is just one panel under the whole board with most of the parts above the display being transparent. This approach should be far less complicated to build, more robust and cheaper.
Honestly, I don't think I need an LCD in my keyboard but I'd quite like to have a go on some mAgLeV hall effect switches! On that note, if you like magnets and/or keebs you might be interested in Void switches[0] -- 3D printable hall effect switches
[0] https://github.com/riskable/void_switch
I feel like you're out of the loop when it comes to keyboard nerds. Check out the dactyl-manuform [0]. The days of tiny 40/60 keyboards are gone, they aren't cool anymore (joking of course, use what you want).
[0] https://github.com/abstracthat/dactyl-manuform
If you will use QMK powered keyboard (or similar) you can even map mouse movements to the keys [1], so you won't move from keyboard at all. On my keyboard, I have wasd style mouse movement on ijkl keys, and it works quite well.
[1]: https://github.com/qmk/qmk_firmware/blob/master/docs/feature...