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Ah. I see. Try the freezer. It didn't work for me but it might do on an Al/Al interface. If you're likely to lose the stem, possibly the only way is saw the top off and try to saw a line down the inside and chisel/peel inward. Messy and awkward I realise.

I had a seat post stuck in similar manner. Pulled a vice off a bench trying to get it out. Eventually after trying all recommended methods, moved to method of last resort, which was to fill seat tube with caustic soda (solid stem so didn't run out). Leave to froth and top up until 2-3 weeks...