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if it's in the shade, very few things will go quickly
I can definitely vouch for holboellia being instantly rampant even in the fullest of shade. Despite this it is easy to cut back when needed.
More info here:
https://www.architecturalplants.com/product/holboellia-latifolia/
The problem you've got is if it's in the shade, very few things will go quickly.
Have you thought about painting the corrugated iron? I wonder if you could take a different approach like putting a mirror in the middle and painting a mural - I'm sure there are sources that allow you to scale up images and print on A4 sheets.