Scripting the unhiding of Library folders on Time Machine disks
Could you use something like this?

sudo /System/Library/Extensions/TMSafetyNet.kext/Helpers/bypass chflags nohidden /Volumes/*/Backups.backupdb/*/*/*/Users/*/Library/

bypass was in /System/Library/Extensions/TMSafetyNet.kext/Contents/MacOS/bypass on Lion.