import nuke


for n in nuke.allNodes('Write'):
    print nuke.filename(n)
    nodeInput = n.dependencies()
    newWrite = nuke.nodes.Write(file=nuke.filename(n))
    newWrite.setInput(0,nodeInput[0])
    n.knob('disable').setValue(1.0)

This allows you to take a node that has expressions in it and create copies of them that are hard pathed.  It will also disable said expression driven write nodes and disable them.

Replace procedural Nuke Write paths with real paths in write node by replacing the write node(s)

file, python

Python