Since its a relatively new building, ask the manufacturer of the trusses what you would have to do to accomodate your request. I would think that they could give you some "off the record" suggestions. Or ask them how the truss would be designed,if they were building it. Ask them for a price and the sketch, so the codes person can inspect it.
Either way, I would sandwich the existing truss w/ 1/2" plywood. Glued and screwed on all chord members.