When the 'Specialist Aircrew' scheme was first mooted, apparently consideration was given to some form of distinguishing insignia - so those about to be able to opt for Spec Aircrew terms were consulted.
Once the discussion dropped to the level of 'secret handshakes', the sponsor sneaked back into his hole in the Air Box and nothing became of it all.
Perhaps there should also be a 'brown nose' medal for those chiselling thrusters amongst aircrew with 5 or more years in staff appointments shuffling paper rather than flying?