I know this is an old post. I wonder if the contract ever came through? I've also seen the Facebook memes regarding this "not-so-green" part of the green energy solution generates in landfill consumption. These windmills also generate a lot of waste oil in their lifetimes, too. Not really as green as they are touted to be but then, sheep are non-thinking creatures that is easily led about through manipulations of unicorn fart inspired ideas designed to sway the masses.
Everything that I know about water jet cutters is that they are very SLOW and expensive to maintain. Unless it was a stationary unit mounted to the blade or ground, I doubt it would be feasible to operate with a hoe. Too much precision required with this method to allow a hoe to keep a cut going. Using the hoe to manipulate the pieces to a set saw system should work with a fluid coolant & contaminant containment system.
A stump grinder attachment or a quarry saw attachment on a hoe might work but too much residual dust would be produced to be a safe solution unless it had a high flow flood coolant system.
Something medium slow cutting with minimal dust production should be best. A slow operating, hydraulic guillotine type device or shear system with misting coolant spray in an enclosed chop chamber would likely be the best option for a long term contract with these blades. I should think that a Vee shaped blade with serrated edges would be effective or multiple Vee tips depending on force required to penetrate the medium. Mount that on a system like a car crusher frame where the turbine blades could be dragged through with a hoe, cable drag system or feed table and use the hoe to handle the resultant pieces to load out trucks or trailers.
Like a customer once asked me, "Can you build that?"
My response was, "Throw enough money at a project and you can build anything."