Having seen what I've seen on tractors where I've relocated improperly placed hooks, I'd not have much faith in that dealer; sorry. It really isn't a good idea mounting hooks outside the lift arms. Personally, I'd have them relocated to a proper position even if you don't plan on keeping the tractor. Please don't take this wrong, but it's your tractor and do with it what you please.
It's sort of like using the wrong tool for a job. You can get by with it a lot of the time but sooner or later it's going to break. As expensive as tractors are, I'd not put strain on my loader that I knew it was never intended to take. A hook on the far outside of a bucket really torques the loader arms as well as the loader frame itself. But, there again, I didn't pay for your tractor and I won't have to pay to fix it if it breaks from improper loader use. I have a neighbor who hauls a 12k goose neck trailer with a 1/2 ton pickup. So far he hasn't paid the price but the odds really aren't in his favor.