Get a set of small earbud with a good seal - sony models all work well. The buy an adapter to change the large plug on the panel to the small female jack the headsets expect (3.5mm plug to 2.5mm socket)
That's an interesting thought.. I use some etymotic (mid-range audiophile type inner ear monitors) that claim 41db noise isolation; certainly work on the tube, never thought of trying them in the plane!