I can't square "my priority is benchrest" with a carbon compromise like the Gunwerks (which I own gen 2, btw).
"My priority is benchrest" means: leave the rifle alone, don't modify the stock on a field gun so that it has a permanent cheese grating protrusion. Get a concrete block and a sand-filled bag (#RokBlok), and get a great rear bag (like a jellyfish), and go shoot. If bipods are a mandatory kink, something like the Accutac or an over-center design would make substantially more sense for pseudo-benchrest than a Gunwerks.
If "my priority is extremely fast prone shooting in areas where I am able to take prone shots at animals enough to justify an extra pound," then the answer is a Harris.
If "my priority is achieving a front rest in the field when I don't have my backpack, but still being able to shoot benchrest without impeding the rearward movement of my stock," then the answer is a spartan(s).
-J