Hetairoi Kataphraktoi as a "regular" unit

[Mister V]

I realise that a new entry must be made into the unit roster (do I need to replace another unit because of the hardcode limitations?), that wouldn't be so difficult to do, would it? I would just like to see more of them in my campaign, because they're so beautiful (and deadly)
As far as I understand it involves making a new entry (or a replacement one) in the EDU and then going over to the edb to add them to recruitment buildings somewhere around:

       }
        royal_barracks_K1 requires factions { romans_brutii, macedon, } and building_present_min_level government gov1 and not hidden_resource not_here
        {

...near the hellenikoi kataphraktoi.

Have I missed something? Is there another way?

EDIT: I thought that I could replace Baktrian hellenikoi kataphraktoi stats and model with the hetairoi kataphraktoi ones. However, it seems that would make the AS get them, too. So I do have to create a new unit entry for them?

EDIT2: I've tried adding them, CTD after the first loading screen. And for some reason the EDU gets replaced with the default one every time.



Oh and - is there a model for the Bartixiai Megaclasmai?