that's not club footed... It high heal and weak wall causing flaring out and that odd shape.. That foot is way to up right and its actually not really a hard fix.... start by lowering the heel and taking some more off the outside. This will allow for better weight distribution. Its hard to tell but if his inner hoof wall is rolled under then you will want to take some off the inside as well cause you want to see his hoof unroll. Its hard to say where to go from there though, its all a matter of how his hoof reacts to your trim....
My old gelding was pigeon toed and club footed in his front end, and I had him shod (trusted my farrier)... and it kept getting worse. One day I just took his shoes off and did it my self.. working on his feet once a week to even him out best I could.. he was more balanced and had better movement... landing heel first...
With any horse, and especially a horse with hoof problems it takes time to work through, but I think weekly minor adjustment help more, cause your not cause extra undo stress to there tendons and stance. If there have poor trimming there muscles and tendons will get use to it over time. So massive change will cause great discomfort and more problems you will have to correct later.
His foot looks like that cause he has a weak hoof wall, high heel, and poor trimming job causing flaring and then when the flaring was not addressed it started back up the hoof wall that is why you see waves. He needs to be bare foot with a good almost (to much) of a mustang roll to remove any pressure off the outer hoof wall. Then rasp off some of the waving to help the new hoof wall have a path to follow. He also need a good break over point (ie rasping the front of the hoof flat to allow his foot to tip over when he is steeping) With out a good break over point you will again put pressure on the outside wall (avoid this). The rasping heel and side walls will balance his foot (make sure it flat side to side and front to back when you look down it) If his whole foot seems to be leaning to the outside that's cause the outside wall it to long causing his weight to rest on the inner wall and the inside wall is also to long but slanted under cause it to look short, you will need to trim both the outer and inner wall but more so the outer to let his weight come off the inner wall allowing it to grow back out to the right angle. You may even need to over trim the out side wall a little ie. The inside wall it slightly higher to allow the inside wall to grow out with less pressure.
If your not going to handle his feet your self, you should still educate your self to know when you farrier is messing up. Cause this is how problems like this happen, just a lack of knowledge.
Hope that helps... that just what I would do, but I am not a professional.
Cowgirl Up and Git R Dun