I found a headset setup that works pretty nicely for live stuff.
They're bone induction headphones with a stereo mini plug. I've been using them with my Yaesu VX-3R walkie for listening to the PL. Personally, I like them over a modified noise canceling option (like the Bose ComfortQuiet sets) because I can block out all noise rather than fighting to cancel the noise. Also, noise cancellation only kills some of the noise, so I gotta turn the PL up pretty loud to still strain to hear.
These sit just in front of the ear canal, resting against your head. Your ear canal remains unblocked, and the headphones play "into your skull". If your stage is quiet, you can still talk to (and hear) your talent or people around you while also hearing the director or anything over PL. If I'm on a loud stage or loud event, I wear earplugs to block any noise coming through the ear canal. The sound bypasses the ear canal, so it actually sounds very isolated and clear.
I did a live concert (small studio) deal with earplugs and the headphones, and I was amazed how well it worked compared to other solutions. I also didn't go home deaf from cranking up the PL volume to fight the noise that still got through other headphones.
Downside is it runs off a battery, but they last 12+ hours and charge off Micro USB, so you can charge it off a PTAP with the right cable. I'm also going to try and get the microphone on the battery pack to work, but it probably won't with the Yaesu.
Regardless, if you fly with a mic on the camera to talk back, then this works as a pretty good solution.