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@Archie's_Grobags
One very important thing to bear in mind is the strength of the pawls inside the freewheel....the amount of force your legs can produce when driving a freewheel will be nothing compared to the force of effectively turning it into a fixed cog and completely locking it up every time you skid.
On a normal freewheel that kind of force is never there because the wheel will just keep spinning faster and the pressure on the pawls will never really get past a certain point.
The pressure on the pawls when forcing it to effectively 'lock up' ,especially from the kind of speeds you're hoping to achieve will be increased by a very significant amount.