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@hilarystone
The classic method framebulders use to get truly stuck aluminium seatposts out is to melt them out - the aluminium melts before the braze or tubing gets affected as long as you watch what you are doing with the oxy-acetylene flame. A few weeks ago I had a seatpost stuck in an MTB frame that had over 10in stuck inside the seat tube - there is then no alternative to melting it. Of course the paint does get destroyed.
With micro-adjust seatpins most will eventually come out using a vice to hold the pin and levering the frame around - there are various freeing agents avaiable from car accessory shops that definitely help the process.