Ok I made a PR:
ap2000 add shift register for c000 - fixes the missing 9th pin line #7366
I cloned a fresh repo so I wouldn't make a mess.
It's strange, testing it out but the keys stopped working, like holding keypad 7 (FF) when starting up to get it to go into self test mode. And holding down keypad 0 to toggle online doesn't work either.
