You're doing exactly what I've been thinking of.

I wanted to add an infantry unit to the Greek_cities faction that only used a sword, no spear. I think you're doing it the proper way though!
I was gonna just use a Seleucid unit and edit the ownership line, though I'm not sure if that'll work. They seemed the closest in terms of culture etc. After that I can find a texture I'm sure.

If you get success any chance of letting us (by that I of course mean me!) know? I'm fed watching my armoured hoplites getting slashed on a wall because I can't constantly tell them to use their swords!

Hope you get it dude!