I wholeheartedly agree that 505 Games are rubbish.
I´ve never experienced a publisher with such bizarre distribution.
However: Ar Tonelico was not only released in Italy. I can tell, because I have a French edition right here. And actually, I believe that it is likely there is an version with english box text out there too.
Other RPGs by 505 did have a UK-release at least. Magna Carta, Stella Deus, Wild ARMs 4, Wild ARMs 5...
The three places that to my knowledge always get releases by 505 are Italy (their home), France, and the UK.
Problem is... sometimes one language version is nearly impossible to get. I give you one example: Wild ARMs 5. There definitively is a version with English box from 505, but it is ultr@ r@re. When the game was released after a long delay with no updates on release dates or anything, the UK-version was distributed so scarcely that most shops never got a copy, and some shops got as few as one (!) copy.
The print run must have been extremely small, but it exists. I could imagine the same thing for Ar Tonelico.
Sadly, 505 does not answer if you use their contact form for any question. I´d have liked some more in-depth information on that myself.