That is the simplest solution. Any kind of shoe adds to the load on the wall. It is best to remove them. If the sole is still intact, the soft sawdust is great. It is critical that the horse be provided with a large area of turn out on a 24 hour basis.
Exercise simulates circulation which promotes healing.
Next it is important to provide for positive drainage of the fluids building up under the wall and sole callous. Rasp away the hoof wall or cut gouges through the wall thickness exposing soft moist horney laminae adjacent to the sole abcess. Apply a poultice over this exposed laminae on a 24 hour basis for 4 to 7 days, until no more fluids are drawn out. The target when trimming the hoof is to lower the heels to position P3 to be level with the ground. You may not get there exactly on the first trimming.