Pretty simple... Just signup for a playstation account in the japanese region and hit "Playstation plus" in the XMB to see the free 7 day trial...No limit on redemption / account creation per console.
Gives quite a few games...Among them god of war HD collection.
But, Anyways, Here is a snapshot guide for those of you who are inexperienced with other region accounts.
And trophies are always a bonus.
NOW GO GET THEM TROPHIES