There are only 3 orientations as far as EO is concerned, and each of those only had 4 possible lines, so there are actually only 12 EOLines. However, since it is so easy to influence the line during EO, there's very little advantage to being able to use any line, so if you were to be full colour neutral, it would make sense to inspect the three EOs, choose the easiest, then inspect the line based on that
There is only one person that I know of that is attempting colour neutral ZZ and that is
@CubingGenius, and as far as I know, he only inspects one line for each EO.
Honestly though, EO is so easy, and the line is almost 3 moves or less, so there's only a marginal benefit to being fully colour neutral. Just y neutral is enough.