How do I get this Syncros Cattlehead off my headtube?

Mallet sounds promising.😃

Also Aluminium expands much faster than steel, so some gentle heat will help, even boiling water.
Lacquer and paint are usually ok to 200⁰ if you want to get a blowtorch on it...
Oh, and the mallet!
I drop the forks into the bench vice with scrap cardboard to protect them, a wooden broomhandle is ok to a point - you need to bear in mind the equal and opposite reaction to any force, and what that might do to the paint!😬
 
I'd try and secure the stem and use the forks (Luke) to try and break the corrosion that's holding it all solid.
 
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