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Great info on this thread even though we have discussed stuck fixed cups before.
I have a 72 Le Champion that was rendered inoperable by a car back in 2009. It had the same Stronglight BB. Getting the fixed cup out was an exercise of experimentation. Did most of the suggestions above.
The one that worked for me was to leave the Sheldon assembly on the fixed cup to absorb the heat and used a flame to heat the assembly up. I did not burn or brown the paint at all with the result of it coming off reasonably easily comparted the the amount of torque applied on pervious attempts. At the time I was hoping there would be an opportunity for repair. NOT!
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