I have been playing with a new Cowboy 0.8 release and built Simple_Bridge bindings for Nitrogen.
Simple_Bridge fork for Cowboy 0.8 can be found here.
I converted Nitrogen_Elements_Examples to use Cowboy 0.8 so you can use it as a starting point.
Please notice that this is not *officially* supported release, this is just experimental project. I will follow up with Nitrogen maintainer Jesse Gumm and if he agrees, maybe this fork could be merged into official Simple Bridge repo.
Please let me know if you find any issues.