I guess the best solution would be a custom lighting material with 2 combined specular setup. Examples here: http://udn.epicgames.com/Three/CustomLighting.html I'm not sure that the aniso map is really needed for this.
I've done something similar in 3dsmax/vray. I used a VrayBlenMat to combine 2 specular on my low res hair mesh: -One very narrow white specular -One very large colored specular to make the hair color All that with an anisotropic map. I did it with vray but it's not a very expensive shader. I'll try to post an image.