It's funny -- when I google the term "insanehedrin", there are only nine reference that show up. Only one of them is from 2005 on Free Republic, and it's by you.
I don't think that this neologism is in common uage by any stretch of the imagination. Those members of the Sanhedrin of today who have been identified are leading Orthodox Rabbis, not part of any fringe group of Judaism. Some of them, such as Rabbi Adin Steinsaltz, are full participants in the "modern" world, despite being quite observant.
You might want to have a look at this. It's not my Rabbi's site, but he did warn us about the "Sanhedrin," Root and Branch, and others associated with them.
Semicha and Sanhedrin Controversies of the 16th and 21st Centuries
Rabbi Yirmiyohu Kaganoff
(origninally in Yated, USA, 24JUN05)
http://www.sinhedrin.com/files/history/semicha_sanhedrin_controversies.html