It's been mentioned before, hop socks with a magnet in them, NOT! the black ferrous ones but the shiny little rare earth things on evil bay, magnet on the outside of fermenter to hold it in place, when you want to hop just remove external magnet, and sock n hops fall into wort. Any oxygen in the hop sock will have been purged during fermentation and the saurus has enough head space for 4 or 5 hop additions, no worries about pressure. I would question the need for 25 psi but each to their own. For hot and quick without the pressure try a Kveik unless you're doing lagers of course.