Hi XXXX,
Supporting limb laminitis is fairly common in these types of injuries unfortunately. The vet's recommendation may be a little premature as I would tend to agree with the farrier that most times these cases can be managed successfully with shoeing and pads. Without seeing the radiographs and being familiar with the horse's condition, this is my opinion only. Cutting the DDFT is a end stage treatment for chronic or very severe (>15 degrees of rotation) cases. I would give the horse the best shot and go with the farrier initially.
Horse Veterinarian
Equine Surgical Residency, Interests include airway and orthopedic surgery, DVM, B.Sc(immunology)