Ok, sticking with the pier concept.
I'd design with foldout legs from the base with braced struts to stabilise it. A bit like SpaceX's rocket design. It could store just as a long slim tube almost. Minimal tools to assemble.
(I like the Steam Punk idea btw)
I've actually got some ~4" Alum tubing in ~1.2 meter lengths that slides together. If I had a need for a portable pier I'd start there and use 'stuff' to reduce vibration. Might have a play with the idea.
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