I got the fixed cup off. Pretty low tech....even lower than the Sheldon Brown Magic Bolt.
I was looking in my tool mess....and found one of those stamped steel multi-tool.....probably circa 1974. Just out of curiosity I checked it and one of the slots fit.
I then used some threaded rod, nuts and washers to hold it tight against the bottom bracket. A few taps with a hammer (16 oz carpenters..... I'm already on a non appropriate tool approach) and it starts moving.
Key lessons a) using some method to hold the tool tight is a huge help and b) some times you just have to hit something with a hammer to loosen it up
