Second that above, contact a heli operation on both sides of the mountains and have a chat with them about were they can put you for your east west split weather wise.
I don't know which areas they can and cann't access outside of the ballot season.
Re tents, I would be staying with something 4 seaon capable as 90 kph gusts are nothing down there. But small enough that you can up sticks and move.
Something like this is a popular local tent. Not the lightest but you need something with a little strength, it's weakness would be sagging under snow loading in still weather.
https://www.macpac.co.nz/macpac-olym...6_clearance=no
If the weather packs in and your pilot is not able to pick you up, you may need to drop down into the bush to get some shelter.
A Garmin in reach is handy here if the piot wants to bring you out early or you have moved.
Z
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