One of our horses suffered a severe bout of laminitis about 4 years ago. All four feet were involved, with significant rotation of the coffin bone in 3 of the four feet. We worked with our excellent and caring vets and farrier, pulled his shoes, got him a pair of Soft Ride boots (a godsend) and worked at rehabbing his feet (as well as addressing diet and health issues). He had convex, bulging soles like you describe. He appeared to be improving, but a couple of months in became much more painful. Cue the appearance of the abscesses, which were likely from a combination of the hoof wall separation and sole pressure from the tip of P3. He was very painful again even in the Soft Rides with us trying to deal with the abscesses as well.
At that point we felt we were not making headway and took him to a referral hospital a few hours away. They ended up doing a major dorsal hoof wall/toe resection, debrided the abscesses and took his heels back to allow P3 to come back to better alignment. To support the foot while it was healing and relieve sole pressure without putting weight on his dorsal hoof wall, he spent three months in reverse shoes with a wedge to correct his angles. He did not have pads as his soles needed daily soaking and packing where they were opened up to clean out the abscesses. He spent weeks there until his feet had healed and stabilized enough for us to manage him at home.
It was well over a year of rehab. Eventually his sole regained a more normal appearance, although his sole depth will never be the same as it was pre-laminitis. He wears shoes (now pointing in the right direction!) and pads in the summer when the ground is hard and and he is ridden on rocky trails. We are very, very fortunate that he recovered and is now comfortable and rideable. We came very close to losing him. We manage his diet, health and feet very carefully. We do not regret any of it.
That said, we agreed that if he has another big laminitis episode, we will not put him (and us) through rehab again.
It was a huge amount of work. We were exhausted by the time he went to the referral hospital, and there were months of rehab after he returned. If he did not live at home, with two people sharing the work, we could not have done it. It was terrible to see him in pain, and although we are lucky enough to be able to afford his care, not every horse owner could. We deal with abscesses occasionally and seedy toe a lot.
To my (non professional and only somewhat educated) eye, there may be some shoeing changes that might help. Horses that have had severe laminitis do not grow foot like a normal horse- they grow much more toe than heel, and the heel tubules tend to get crushed- I think that the comments that place all of the blame for the appearance of your horse’s feet on improper farrier work are forgetting this. It is really difficult to manage these feet. I am glad that you are getting another opinion and X-rays to inform your decision making. I will say that from my own experience, I do not believe that every horse with laminitis can be managed barefoot. And I don’t believe every horse can be brought back to comfort long term.
Good luck with your horse. Whatever the outcome here, he is very lucky to have such a caring person.