I too would love to see her play P3(hopefully P3P due to the updated features) because it is one of my all time favorite and more exposure to it is always great.
Don’t really know how it is possible to convince Atlus though, since they’re pretty stubborn when it comes to modern ways to promote and etc. Hell, these are the same people who were surprise to find that everyone and their mother brought P4G the moment they finally ported it to PC despite Persona 4 being the game that literally brought Persona to the top of the world, being one of the greatest games of all time and what truly established the Persona brand name.
Either way, if buying P3 again (maybe P4 too) will convince them to finally let people promote it via stream, I’d buy it again in a heartbeat.
I mean it took Nintendo roughly 20 years just to get streaming licenses easily and that was a big ball move for Nintendo cause else they will be throwing DMCAs left and right no end in sight