Howdy Again
Turning the barrel slightly is a good solution on a Colt Single Action Army, or replicas, because the barrel is a straight tube with nothing but the threads holding it in place, and there is no ejector housing or stud on the underside of the barrel.
I am not familiar with the revolver in question, but from photos on the web it appears to be a rough copy of a Colt double action revolver, with an extractor rod housing forged onto the underside of the barrel. Not an ideal barrel for turning. On top of that, in the photos I saw, it appears the barrel is pinned. So unless you want to pay somebody to weld some metal where the pin is, and redrill for a pin, which would be pretty difficult to get lined up properly, turning the barrel is not an option.
Besides, I am betting that the inaccuracy is because of inexperience with fixed sight revolvers, and not the fault of the gun.