WRT the allen key, you could have drawn their attention to Regulation 4.65
(4) A person is authorised to have a prohibited item in his or her
possession in a prescribed aircraft if:
(a) the prohibited item is a tool of trade; and
(b) the person keeps control of the prohibited item at all times.
Tell em you need the allen key to tighten up your head set or something.
The tools that are listed in the regs as being "Prohibited Items" include:
Been there, done that.
Had my Nav bag confiscated so sat down and refused to fly the aeroplane and rang the Co. Half an hour later Nav bag returned, gasket blown, calm down time required. And all that was after 6+ months passing several times a week through the same screening point with the same jewellers screwdriver, to adjust headset depending on left or right seat.