While some keyboards like this might use a standard USB connection to join the two halves, the ZSA Voyager uses I2C instead and even breaks the I2C bus out with a pogo pin-compatible connector.

Same Sky has added 40 high-reliability models to its pogo pin selection. “The CPG family of pogo pins ... and some work over -40 to 85°C. Picking the CPG-11-SMT-B almost at random (left in the photo), ...

By taking an existing known-good PCB, stripping off all the SMT parts, and moving the through hole components to the rear PCB side, pogo pins could be soldered to strategic locations. Building the ...