I agree with most of the things you said. However, if I didn't understand incorrectly, you said that the Caucasian Swordsmen unit should be replaced by a Galatian one, right?
If that's the case, I think the mod starts too late to include Galatians, unless someone wants to script them in. Caucasian Swordsmen might help to get some med sw infantry around that area, considering that it's all mostly spearmen.