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Toseek with this pattern of head works as long as you sit over the axis. IIRC some people have had issues when they load the saddle a long way off centre, which is unsurprising. Available in straight and set-back versions (and aero ones too), so you should be able to avoid that problem if you choose the right one. The advantage if you live in mortal fear of QC issues is that the carbon bit is a very simple shape with a simple loading (circumferential tension around the big lateral hole)
What would be forum approved Aliexpress carbon seatpost from known manufacturer like ican etc?
27.2mm needed.
Thanks!