No we don't our exercises don't just concentrate on conventional ops anymore they are multi faceted ie 3 block war, our primary focus is the Amphibious JTF, to be honest if we are practicing air attacks we are either heading to Korea or Kiev and if we are we will be part of another massive USA lead Coalition. The other reason with todays tech with UAV it is impossible to hide in dug in defensive positions it only leads to your force be taken out, Army has SOP they are the same as for Artillery or Air attack its called dispersion.
AW109 primary purpose is training with some very limited Operational roles ie support to NZSAS black role, the Primary Helos for the JATF are the NH90 & SH2G(I), you need to read this to understand where we are going ref joint fire support:
http://www.defence.gov.au/adfwc/Documents/DoctrineLibrary/ADDP/ADDP_3_1_Joint_Fire_Support.pdf
To be honest Army has more that enough fire support to land anywhere in the Pacific and to pay for the arming of the AW109 will come out of the current budget which means something else will get deferred or cancelled. Remember your not only bringing in a adhoc system but trying to introduce a whole new capability? it would be better to purchase AH1W from USMC stocks.
We will never be alone that's the point about Coalition Ops, If NZ is conducting SASO operations which are as low as you can get then we already have enough combat power to mitigate any known contingencies in the Pacific.
Army wont be deploying without the Navy that's the whole rational of JATF three services one force, JATF 2015 is step one Force 2035 is next. Don't have to imagine blokes with semi auto's running amok in East Timor been there, its not as simple as you make it out to be ROE restricted us back then and will do the same in the future regardless if your got a ANZAC or a rocket/MG armed AW109 you still have to apply ROE's to the situation.