It is a hack, not a real driver. The Language Roms use a different keyboard driver on other memory zone, but also the zone is not used the same...
On the other side, not very useful, because games don't use the keyboard driver, they scan the hardware directly.
To do something similar, I would search on the Rom the keyboard call from the Editor driver, then instead of asking the status of the internal joystick, change it on the Rom, only one byte, a 0 by a 1 or a 2. But hacking a Rom is definitive on the real EP, not a simple software in Ram....
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