Wire balustrade on steel posts

Hi All,
I am looking for some advice regarding balustrade for my proposed deck.
At this stage my deck will be attached to the rear of the house. (Full brick house), 4000 X 5000mm with a landing of approx 1000mm with a staircase attached. The highest point of the deck is approx 1600mm of the ground and the lowest point about 1100mm. ffice:office" />
The deck will be constructed using 100x100mm Duragal posts through to a pergola. with my bearers and joists in timber as well as handrails.
I have searched through many posts but have not come across anything regarding cabling through gal posts.
So my questions are -
Best way to attach saddles to the posts? I can only think of pop rivets is there any other method?
Is the risk of drilling all these hole in the gal posts going to rapidly increase the onset of any corrosion or rust, how can this be minimized?.
I have attached a rough layout of the deck. Post spacing for the majority is about 2000mm .
My last resort would be to return back to timber balustrade

Any suggestion would be greatly appreciated,
Thanks
Anthony

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