'I like to leave things intact so I'll refrain from clipping off the 'copter jack.'
So glad everything worked out Richard and I totally agree with leaving the copter jack as is.
I look at it this way ... you wouldn't remove the barrel from a Luger simply because your not going to shoot it again ... similarly I wouldn't remove the jack on the headset adapter because I don't anticipate ever flying in a copter anytime soon.
I love your headset too ... it's an antique piece of kit that is collectable in its own right.

Enjoy