Turkey - once a month wets and decks might be enough to keep an experienced crew current but is nowhere near what you need for an inexperienced crew.
The problem with box-ticking training is that they could keep current on something the size of a super-tanker and then be faced with a yacht as their first night job.
Despite using NVG for most of your ops your crews will end up doing decks on white light so make sure the aircraft lighting set up is good enough - floodlights plus steerable spots and a means of illuminating the tips and tail.
I trust if you are doing night wets that there is a hover trim facility so the winch op can fly the aircraft with limited authority - our SOP for night wets is hover trim - try doing a manual drum in tricky conditions and you will see why.
Train hard - fight easy.