I think the problem might be that the spears are part of the model itself. If you are going to make a Greek infantry unit you might have to use another model, only then it would not look particularly like a hoplite. It is a problem for people who want to make a unit that is very like one in the game, but just has a different weapon or shield or something.
At the worst you could re-texture Iberian Infantry or something, and give them to the Greeks - it wouldn't look too bad. Otherwise we just have to wait for someone who know how to change cas files to make a hoplite with only a sword.
You could ask on the forums ..... politely.