The proposal to shift Rnwy 11/29 west wards to reduce the Helipro (Calibration Flight's) hangar to dust, just invites problems.
Leave 11/29 in place and if necessary knock down the hangar.
The Resource Management Act (RMA) allows you to continue current use. Shifting 11/29 westward shifts the approach path over residential areas which were never previously below the flightpath so instantly Noel Robinson gave himself a swag of new enemies.
Stick with the current 11/29
Create an industrial estate at the west side of 16/34.
Offer to pay for the gliding club to re-establish at Otaki. That solves a swag of issues.
If you want to be a successful developer then you have to be a problem solver... Not a maker.