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@lae
BB cup is strange - I thought that all 20t splined cups had the same pattern. Perhaps it is a problem with the design of the tool rather than with the cup - I have been using the same Park BBT22 tool for years and have never encountered a shimano 20t cup that it didn't fit... although if you can't find a tool to fit it, it's easy enough to cut out a plastic cup.
The removal of the headset will be made much easier by buying or constructing the proper tool. I used to use a home-made tool (22mm copper pipe, cut some slots in it and flare the ends out) which cost about £2 but only lasts for 2-3 uses before it crumples up. A Headset Rocket is about a tenner, from memory, and seemingly lasts forever. Soaking the headset in penetrating oil helps (PlusGas, diesel, Duck Oil or even WD40).