i dunno.

basically, your suggestion would give me the same results i used to get when using V3 and M3 textures that slapped the texture on the lens.  imho, they looked awful, flat and like bad colored contacts.  they were always improved by placing the texture on the iris and using refraction or even just transparency and fancy highlights.  but maybe you have some better tricks than i've learned over the years.

edited to add: you almost definitely have better tricks than i do.  i can say, however, that my experience was not only negative, i used to be able to spot the dead look of textures on the lens all the time in the galleries.  so it wasn't just me that couldn't get them to look good.