Came across this while combing through my comments and thought I'd already answered, so pardon the delay.
People have certainly tried [1][2], but the big issue in the design is that the switches don't operate as a standard on/off (trivial to detect), but are instead capacitive, in that the current passing through the electrocapacitive pad on the PCB is somewhere between 1 and 0 (exclusive bounds, iirc, and simplified) at all times, dependent on how far the 'switch' above it is being pressed. This old repo seems to explain it well: https://github.com/tomsmalley/custom-topre-guide
Price and marketability are also issues. Split keebs are niche, ortho keebs are niche, EC keebs are niche, and you're talking about fusing those three together. People would 100% buy in, but it would probably be a microscopic market, to the point where the project would be financially lossy, even if you were selling them for $400 apiece.
The closest you/one might get for now is by buying two of these[3], unless you're dedicated enough to DIY.
People have certainly tried [1][2], but the big issue in the design is that the switches don't operate as a standard on/off (trivial to detect), but are instead capacitive, in that the current passing through the electrocapacitive pad on the PCB is somewhere between 1 and 0 (exclusive bounds, iirc, and simplified) at all times, dependent on how far the 'switch' above it is being pressed. This old repo seems to explain it well: https://github.com/tomsmalley/custom-topre-guide
Price and marketability are also issues. Split keebs are niche, ortho keebs are niche, EC keebs are niche, and you're talking about fusing those three together. People would 100% buy in, but it would probably be a microscopic market, to the point where the project would be financially lossy, even if you were selling them for $400 apiece.
The closest you/one might get for now is by buying two of these[3], unless you're dedicated enough to DIY.
[1]: https://geekhack.org/index.php?topic=97975.0 [2]: https://aficionerds.com/en/blog/20210205_crkbd_ec/ [3]: https://geekhack.org/index.php?topic=106685.0 (Groupbuy is ended, so you'd have to rely on aftermarket, which would probably be tiny and marked up)