Regarding pax vs crew. In a past life doing aeromed, we had medical crew who only joined us on occasion when required.
If you classified the flights as "AWK" then you cannot have "passengers" on board.
Only crew can be carried on board an "AWK" flight.
(6) In addition, the carriage of persons, essential to the course of the aerial work operation as prescribed In Part D of this Manual, shall be clearly briefed before flight that the operation is aerial work and not charter and that the compulsory seat liability insurance as required by CASA for charter passengers is not applicable to the operation. No other persons shall be carried.