Kudos to you for still rocking the P3P! It's a great aircraft and was my first DJI drone. Obvs you have the upgraded board on your GL300 remote which has the HDMI output. I hope you find a solution!
Not really. Your gonna need DJI goggles for that. The originals are cheap to be had on Ebay, and if you can get a pair of R,E. editions BETTER YET. To be honest...yes you can connect a pair of third party goggles thru the HDMI port but its alot...