You *might* find someone looking for a companion animal but I would say that it's not real common.
Also, since you would be leasing him out, most arrangements mean that the owner still pays for the horse's upkeep, so you most likely would still be responsible for his shoes.
Totally curious, if he's a pasture puff, why does he need front shoes?
I think it would be far-fetched in most cases for a leasor to sell a horse from under the owner's nose -- after all, they do not own said horse and that would be illegal. Of course there are dishonest people in the world, but I wouldn't think that would be a "common" thing.
It would be the responsibility of both parties to keep in touch. If you are going to be too busy with college, that may be difficult for you.
If I were in your shoes, I would probably choose between (1) selling him with full disclosure of his issues or (2) putting him down. I know option #2 may seem extreme to some folks but it is a valid option. You say he is dangerous to ride. There is no shame in putting down a dangerous horse that you cannot afford to board. That is the only SURE way you will know that nothing bad will happen to him.
As far as selling him, you might find someone looking for a project that is willing to put some money toward figuring out any physical issues he has. You just never know.
Tough decisions either way, especially when you are about to put yourself through college. But good that you are being realistic about your financial situation.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.