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@Max
Tricky one - usually the other way round in which I would say turn it upside down and pour in caustic soda...and wait.
Problem is any real force on the stem (ie putting it in a vice or using a breaker bar is likely to ruin it.
If the frame really is junk then you could try a severe dose of heat to the head tube (a blowtorch may not be enough). Failing that cut vertically down the head tube with a hack saw from the bottom to just before the base of the stem and prise apart the tube with wedges in the cut.
Seems a real shame though.