Silt removal can be done with hand-guided dredge pumps or other suction devices, mounted on a barge close to the site. The proposal to remove the turrets for preservation has merit. But it is best considered as a method to lighten the ship for complete salvage. The turret removal lightens the hull, reduces major stress on underlying structure, and increases roll stability for the time during which the refloated hull is being moved. The armored tower could also be removed.
Critical damage needs to be stabilized.
The strongest sections of the hull are the extreme ends. This stress is caused by uneven support from below the bottom plates, the overhead weight, the list of the hull, deterioration due to rust and wave action, and the scuttling damage from 26, which has obviously grown worse. Areas approaching collapse need to be shored-up. This shoring is done with screw jacks, plates and knees. Underwater welding is a necessity, of course.