There are plenty of tuning shops around that can put together a kit, but they probably wont due to to the low return on investment compared to the US. We just don't have enough 370's on the road.
These places have done 350z kits so they might look into it.
Nissan 350Z Twin Turbo Conversion
Pure Performance -
HKS Nissan 350Z Supercharger HKS Australia Sydney