To get it to work I had to sideload Firefox Browser. (otherwise it won't let you go to the web login screen). My first attempt failed, but I did a factory reset, sideloaded Team Viewer then ES File Manager, Firefox then finally the XDA PS4 Remote Play apk and it worked! Runs great too. Used the PS4 controller plugged right into the Forge TV.
I posted this on the XDA forums as well: http://forum.xda-developers.com/showpost.php?p=61013361&postcount=721
I really want to try this even though my PS4 is plugged into the same TV. I just hate changing inputs. How is the resolution and performance with remote play?