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Getting the "World Adventure" title screen text/branding would require changing the files, not the region of the console. Sonic World Adventure on PS3 was previously very hard to find online, but me and a few friends managed to salvage possibly the last alive link to the game. I have the files for the japanese version of Sonic Unleashed on PS3, so I could help you.
There's a setting in the Mod Manager to change your console region to Japan (the setting is referred to as "Language", but you can set it back to English ingame) if you're using Xenia. RPCS3 has the same thing in its GUI.