If you can afford to, then I would move, assuming the yard is happy to cater for laminitics / grass restricted ponies. You'd have facilities, company, no babysitting or looking after other people's horses.
I think he's taking advantage of you hugely, and while you may be able to barter him...
Probably because it's not you doing it! Can you imagine the embarrassment as a teenager if one of your parents got involved in something like that. I think I would've died and refused to play the sport ever again.
I'd probably have reported him to the club for inappropriate language and behaviour in front of minors. You'd hope they'd deal with it because that's the sort of thing that seems to escalate rapidly if the police get wind of it. I don't know what it is about some men and football events, it's...
Oh isn't he gorgeous! I like how he's looking forwards in such a cheerful way. I don't know if I'm reading too much into some photos but he looks like he has a nice nature - I like his face.
That's really good, mine had cartrophen but I was never quite sure how much it helped him (if at all). It's so useful to know in your own mind what does and doesn't help your horse.
I was under the impression that if the joint has actually fused it shouldn't be a problem any more - my horse has one fused hock and it doesn't cause him pain. It's the other one - that won't quite fuse (we don't really know why) but is incredibly tight - that causes the problems.
Re shoeing...
I suspect it'll be a trade off - i.e. you can keep jumping her without necessarily causing her pain but the joints won't last as long. Whereas if you just hack the deterioration might be slower and she'll stay sound longer. Talk to the vet, I hope they're helpful because it's a fair question.
I would do the same, until recently my cob (17 now) was having an annual steroid injection into his "bad" hock (the other one is fused and doesn't seem to be an issue) which kept him comfortably sound for hacking and the odd bit of schooling and jumping. I would've gone for Arthramid too but...
Fells are easier to come by than Dales and they are ridiculously strong. A nice fit sound one will carry a huge amount of weight for its size....I'm 70kg and my neighbour's Fell mare, who probably doesn't reach 13hh, will carry me quite cheerfully (she's much faster than my 15hh cob) for steady...
Might not be at all relevant to you but I found my cob was more itchy when a) his insulin was too high, and b) he was a bit fat. (Obviously the two are not unrelated).
Could you pay someone else to clip them or is that an expense too far? Your lungs are so important, like @Gloi says I would do absolutely anything you can to minimise your own exposure to dust.
I hope the doctor's appointment is helpful and you can figure out some ways to manage it better.