A quick addition of the day - this one was really easy to do as interfacing to a normal TI keyboard from the FPGA is way easier than communicating with the PC's keyboard through USB and the server process.

The implementation quite literally only involved in bringing out the keyboard row / column wires from my TMS9901 interface chip implementation inside the FPGA. There are no external active or passive components other than the keyboard switches, thanks to the internal pull-ups of the FPGA.