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This technique is similar to the "ln -s" symbolic link method used on OSXOS X/Linux.
If you are running Windows 7 (or Vista and above), you can use "mklink" on the Renderfarm Workers to have the /Volumes/ path work automatically without any path translations. The best part is that this also works for paths internal to the scene files and not just the external ones specified to the renderfarm manager.
On each Worker (assuming you have MyNetWorkShare folder on MyServer):
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Now if you submit a from an OS X machine that uses the path /Volumes/MyNetworkShare/project/foo.aep, when the job runs on a Windows worker, the worker will use "/Volumes/MyNetworkShare/project/foo.aep" which is now equivalent to "c:\Volumes\MyNetworkShare\project\foo.aep".
See Cross-Platform rendering: Windows to OSX to Linux and vice versaRendering for more information.