Originally posted by master_luke
Yup, master_luke's save clinched me the plat. Just a note though. It's best to use when you've obtained all the trophies outside the two insectron, lv 99, and Seven Star Sword ones. That's because the game does not let you re-do a lot of the things that give trophies toward the plat (like collecting special items, doing blueprints, finishing quarries, etc.). As long as you obtain the rest of the trophies outside the above four trophies yourself, you should be able to unlock the plat.
EDIT: you could probably pop the Ghost Ship extreme trophy with luke's save, but I can't verify that.