I am currently building a keyboard from scratch. Will have matrix (ortholinear) layout and will be running my completely custom controller software so that I ca

I am currently building a keyboard from scratch. Will have matrix (ortholinear) layout and will be running my completely custom controller software so that I can play with the mappings and functionality to my heart's desire. In particular I was thinking about putting sd card slot where I could put steno dictionary and have steno built in the keyboard. Mainly because I typically work on some high sec corporate computers where I am unable to install any custom software.