How to change unit graphics for a culture?

[Caekdaemon]

I've been working on a little mod for my game that was done with the new random map generator that came with Holy Fury, just a few little tweaks here and there to better sort out the world visuals and make them look more consistent and avoid things like having the desert Muslim building style in the middle of Italy.

I've been able to use the charinfo command to find out which of the base game cultures got reused/renamed to become mine and I found that in the 00_cultures file, but when I edit these to the western style gfx...

east_african = {
    alternate_start = { NOT = { has_alternate_start_parameter = { key = special_culture value = animal_world } } }
    graphical_cultures = { occitangfx }

    daju = {
        graphical_cultures = { italiangfx southerngfx westerngfx }
        secondary_event_pictures = bedouin_arabic
       
        color = { 0.95 0.9 0.65 }
       
        male_names = {
            Adam Ahmed_Ahmad Anqarib Asil Bakhit Ber Bogirg Bokdoru Bolad Born Bug Chang Chaski Dahab Dong Ede Ett Ferne Gaguwe Galan Gelgel Gon Habib Hajar Hassaballah Ibedou Ibrahim_Abraham Ishaq_Isaac Issa Izzo Jal Jamne Kalge Kamalgi Karim Kasefroge Kosom Koydin Kukne Kur Lanhjin Magjin Maland Malaz Mbakin Meayge Meewge Moussa Moustafa_Mustafa Murtin Omar Pen Pid Risha Rong Salih Shendi Shuaeib Wadanh Youssouf_Joseph Yug
        }
        female_names = {
            Amm Awdinh Bakhita Ber Bis Bor Buk Chaski Emsire Gaguwe Gosgod Hamam Jamne Kakaw Kimzir Kubuy Kugurg Kulk Lanhjin Maj Mariam Musin Ngid Okk Pid Raqiq Ur Usk Wadanh
        }
       
        founder_named_dynasties = yes
        dukes_called_kings = yes
       
        allow_looting = yes
    }

...I only change the holding portraits and their 3D models, but not the actual units themselves - I still have the Muslim unit models on the map, even though I've done the adjustments above, and I've messed around in the avatar.gfx file and can't find anything there that might be able to explain it. New games still have the problem.

Is there something I've missed somewhere? I'm not trying to edit the models themselves (ie, give them spears instead of swords), I'm just trying to change which model group is used for this culture, and whilst it seems like it should be a really easy fix, I can't find any information about it anywhere.

Any help would be much appreciated!