Hi,
If you can wait few days, Photon network will be supported via an separate addon to playmaker. I am currently porting the demo from photon fully in Playmaker, I am left with rpc handling and chat, but the rest is already totally playmaker driven ( connections, player management, instanciation, rooms management, etc).
I went for a proxy approach ( a prefab with a pre made fsm, very much like PlayMakerGUI), where all messages coming from photon, are then broadcasted as global events. For rpc, it is a bit more tricky, but feasible, basically, having a rpc method with a fixed signature that will then inject the values into the right fsmvariable using the playmaker api.
So stay tuned, it's coming up!
Bye,
Jean