I cooked up a simple scheme for letting ship's power drive my headsets. They happen to be Zulu, but this will work for any headsets that use AA batts.
Get a DC-DC converter (I got mine from Digikey). For the Zulus, it has to be a fully isolated one, they will barf if you connect power to ship's ground.
Wire up the DC-DC converter with appropriate capacitors and connectors. I also put a bleed load on mine. Mount the connectors near your headset jacks.
Cut some 1/2" wooden dowling to the same length as an AA battery. Drill it through lengthwise and string a wire up through the hole. Put a screw into one end and that's your first battery contact-turned-ship's-power-erminal. Do it twice and you have the other terminal. Mark the dummy-batteries for how they get inserted.
I ended up mounting mine inside the center post between the seats. Hooray, no more headset batteries, no more running out of ANR mid-flight, no more nagging passengers to turn off the headset.
Some headsets, like the Zulus, have to be manually turned on every flight. No big deal.
I do not have a schematic, so please don't ask. This setup is really easy for anyone that knows which end of a soldering iron to hold. I couldn't get Flickr to host the image of the pieces, but here's a link: