TAKE A LOOK AT THE STRAFTAT BRANCH IT'S A BIT CLEANER
Simple little command line tool that is able to quickly remap thousands of referenced unity files, writen in C# utlizing multithreadng for the most performance.
Example:
AUTOREMAPPER "path/to/unityProjectDirectory" "path/to/unityProjectDirectory/Assets/!RippedAssets" "path/to/unityProjectDirectory/Assets/!ImportedAssets" true true
AUTOREMAPPER "path/to/unityProjectDirectory" "path/to/unityProjectDirectory/Assets/!RippedAssets" "path/to/unityProjectDirectory/Library/PackageCache" true true