You had me until you went all field use and engagement. When I look at every picture of one of the structured barrels I see tubes that are mid 20 inch length and well over an inch in diameter. You would be hard pressed to find an operator, with the possible exception of a dedicated sniper rifle, carrying something like these into an engagement.
I really believe you are heading into the wrong audience. I can see F class, Bench Rest, Rimfire Benchrest and ELR shooters being the most likely adopters of this technology. I of course can be wrong (yes, it can happen), but I have not seen a picture of a barrel suitable for what you have described as the target shooters. Also the people you said were too engrained in a strict regimen of equipment are in reality the biggest innovators and most eager to adopt anything new that will give them the edge.
Again I am not denigrating your science, just the extent of the it's benefits and now your target audience (unless i misunderstood your explanation)
He can’t sell it to them because it’s snake oil. The wild claims + zero proof confirm that.
That leaves him making up call of duty like scenarios to justify something that makes no sense.