I'm not sure if this has been addressed, but I'm not sure if there is a functionality that would allow to make it so that only certain parts of the uniforms given to teams do not apply?
What I mean by this is that you could set the color of the head to not apply to the character when uniforms are applied, that way players will have uniforms and their own face decals and own face color show and the entire team isn't full of one race.