That picture was taken from the Nacra/Inter assembly manual (http://nacra.us/nacra/17,18,20%20Manual.pdf). I thought it was pretty slick on my I17R: you could rig the ring without the pole in the way and then just slide the pole in. Of course, I had the old carbon end-pole/2-patch snuffer system - things are probably totally different now.
The pictured part appears to be in Performance Catamaran's parts catalog ("pole holder ring" ?) but I doubt it would work well in your application for numerous reasons such as pole diameter differences and the fact that you use rope (not wire) guys.
