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Thanks for all the great advice.
I’m now thinking of separating the posts by ~200-300 mm & welding diagonals to hold the four posts together in a frame - inspired by some rail towers near me. I can then bolt the post end plates to larger plates top & bottom, and then the large plates to footing & mount plate, respectively. I’ll bolt it all up and if it looks ok, I’ll weld together.
Damping is another story. I can fill the posts with sand, but it will be fiddly as I want to keep post end plates intact, so will have to do it through drill holes with a funnel! Maybe there’s an easier/better option? I know some street lights have a chain hanging down their core that mitigates vibration somehow...
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