Cutter,
The splined freehub assembly (bearings, pawls, and all) is removable from the hub body with a 10mm allen wrench. It is designed to self-tighten with the tension of forward pedaling. If the pawls were jammed up to create a fixed gear situation, I would imagine you could back the assembly out of the hub by pedaling backwards.
On further reflection, the assembly might not be able to back out if the wheel is tightened down in the dropouts. Only guessing here, but you might have issues with deforming the bearings / cones or stripping out the threads that attach the assembly to the hub body. I guess you could lactate it. I mean how often do you remove the freehub assembly from a wheel?
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