Good point Faster about the load and being vang-less during gybes. That was a concern I had.
So how do most rig a stand alone preventer? I like the idea of adding two cars to the forward genoa tracks so I can play the preventer sheet just like a genoa sheet. If I am understanding correctly your recommending I attach the mid-point of the preventer sheet directly to some point on the boom vs to the boom via the mast end of the vang as I initially thought.
Pretty minor design change, however I do have an external out-haul and single line reef installed. The bottom & sides of my boom are getting pretty busy but I dont really see a problem adding one more piece of hardware.
I'll see what I can rig up this weekend and report back for more input.