I think a good trim would go a long way in fixing this horse as much as he can be fixed. The horizontal crack is actually your friend- it's keeping the vertical crack from climbing higher. Eventually, as others have said, that will grow out, so I would just keep it trimmed properly to keep any big chunks from breaking off.
The club foot, I dunno. I am not a professional farrier, but I see both front feet and pasterns as pretty steep. It may just be normal conformation for this particular horse. Even if it WAS a club foot, I am not convinced that fighting the horse's natural conformation is the way to go. It seems I read something one time that club feet are a compensation for problems higher up the leg, sometimes it can be the result of one leg being shorter than the other.
So, assuming you don't want to fight the horse's conformation and make him sore, all you can really do is keep him trimmed nicely to what his natural conformation is. I'm not saying the heels don't need to come down some, but the feet are overall pretty long. I just would not try to force him into "normal" angles because they may not be normal for this horse. Use the sole as a guide to what should be trimmed. Anything sticking out past the sole can be trimmed off. I wouldn't go any lower than the sole.
So my vote is to get him trimmed and treat him like a normal horse. (Just what I personally would do).