I've tried editing GYP10 by Phidyos and PS3 Trophy Editor v0.02 by Neo Angelus.
in both cases I managed to get set the trophies I wanted regarding online plalying. but when I tried to instant platinum one game, when starting the game I'd get "Registration of trophy information could not be completed. The game will quit..."
afterwards the trophies would be all unlocked, platinum included, but the percentage would be 56% or 97% in another game.
is there a way to make it work properly? I'd like to unlock the online-required trophies without the game quiting on me.