Lea Leonowicz, senior concept artist at CD Projekt Red, shared the following concept arts for Johnny Silverhand. These concept arts show how Johnny Silverhand looked prior to Keanu Reeves’ involvement.
As we can see, the original version of Johnny Silverhand is really close to the final version. There are obviously some differences, however, you can clearly “see” Johnny Silverhand in these concept arts.
This first iteration of Silverhand had the same long hair, tattoos and body structure. The face was, obviously, different, and he lacked the facial hair (mustache and beard).
To be honest, it would be cool if CDPR could offer this face as a free DLC (or an unlockable). However, this will most likely not happen.
Below you can find all the original concept arts for Johnny Silverhand.
For comparison purposes, here is how he looked in the game.