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@Big_Black_Shed
From the pictures it looks like a sealed / pressed together freewheel. No pin holes.
The park tool looks like it would work.
Do you have access to an engineers bench vice??? Try gripping very tightly on the sprocket, not the teeth, to crush the outer to the main body and turn anti-clockwise.
Other than that, a big hammer / screwdriver or punch. And some choice Anglo-Saxonisms.