Sony already does make an aviation version of the headset you mentioned (and has done for several years) so impedance shouldn't be a problem. Its model No is DR6010 and I believe that one of the major airlines (JAL perhaps ?) has issued it to flight crew for some time now. Have a look at
www.marvgolden.com although there are quite a few other companies around that will supply it (this just hapens to be the first I found).