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@gbj_tester
You could also build an arbitrarily long tube with the top formed to take what I always think of as the Syncros clamp, you can find chinesium knock offs to this day to get the donor parts, no glue or precision measuring required
Or just buy this jtek 31.8×520/580mm Brompton post
https://www.sjscycles.co.uk/seat-posts/520mm-jtek-titanium-seat-post-for-brompton/ which is pricey but saves all the trouble of finding a machinist willing to make you a custom tube for under £120
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