I really don't think it's worth considering modifying your system for just that game. Research a piece of software called 'Swap Magic', and the 'Slide Tool' that should come with it (or something else if you have a slim PS2). I use this on my PS2 for a few of the imported games I have.

Shinobido Imashime (Way of the Ninja) seems like it will be making its way to international territories, but dates haven't been set. When the game's official website is in English, it's a pretty good sign.