Can you run a Hammerschmidt on the Pivot with the adaptor? I'm sure you can in theory, but will the torque be too much for the one 6mm set screw to handle and cause it to spin.

got some company sponsorship behind it now too, should be a very good prize list and cash as well.

I think this is an awesome bike. This is also very good for a prototype coming from two guys working in their spare time, Well done. I think gear boxes are the future for sure, they are sealed and will require very little maintenance, over time they will get smaller and more efficient (and cost less). I just switched to a Hammerschmidt and I can tell you I'm never going back. I just have to get rid of the other derailer and I'll be set.