I disagree. As far as weight and surface finish: The Gras KEMAR head is smooth (so smooth it shines) weighs 17.1 lbs for a head, neck, shoulders and torso and is another standard in Etymotic research.
http://www.grasinfo.dk/documents/pd_45BA_ver_12_10_07.PDF
The soft pinnae are cool but I could likely get that to work later if I tried. The KU100 is around 8lbs which is in the range for the human head though but the fact that the KEMAR is lighter points to this being not much of an issue. Also I could easily add weight anyway.
Mic quality is an issue as you say but if I set it up this way I can easily switch to earthworks M30s which I argue are about as high quality as it gets and the ECM8000s I was starting with are very well reviewed for sound quality and low distortion at least on the websites I've visited.