Hey Impedance-pig, you need a new 5 ohm mic and module to replace your high impedance one on your headset-X. They cost around USD$300 and in my mind, are not worth the money for turbine work. Best with CEP I reckon. I did find an interesting gizmo;

More info
here. As you can see, it replaces the cover on the mic mount on the spare side of the headset and takes a 3.5mm plug straight in. Only for music or listening to phone (no mic for phone) and no auto mute. Price is right though...
I have used the flightcell units and found them good but I can't really recommend them for the money you pay. That said, for calling in half hourly scheds on the sat phone, they were fantastic. I didn't care for music when flying low level, just couldn't concentrate. Pity we are not allowed to have music in this line of (sometimes a little dull) work.