isnt it possible to say you live in, for example the netherlands, when you make an account so you get the european psn?
i've heard about people doing that to get in the japanese psn (and ps store)
PSP games are region free, so maybe pick up a cheap euro copy on eBay? IIRC you could download the DLC via the internet and transfer to PSP with a thumbdrive (but it's been a while since I sold my PSP, so Im only 99% certain that's how I did it).