Am I missing something? I counted 5 colors. Blue in the Flags, Red in the Flags, White in the Flags and State Fill, Black where needed, and Yellow. If the Emu has a different shade or something close to another color we are already using, why not change to that other color or use what we have Yellow, White, Black, Red, and Blue along with heavy use of outline and the the shirt color be the fill for the Emu. That would be 5 colors correct? Did you have a look at doing the Emu in all black fill since the State is filled in White, one would think people would not think that was an extension of the state outline (yellow bill, white eyes and white accents)? Just spit balling here.
Basically adds a Dollar to each shirt for each additional color used so that would be $16 a Shirt.
I'm not being critical just making an observation, both of the designs you just updated are both full fill and don't take any advantage of outlining with the choice of shirt color.