The installer has a fallback function that, if the Symbolic link creation failed, it will try to create a Junction instead, which is another kind of link that should work with exFat.
However, is a code completely untested, so it might not work, also because it runs a command line, since there's no native way in .NET to create a Junction, so it might be affected by permission issues, etc.
No, please, DO NOT copy the whole thing in the Community. If all else fails, use the Addon Linker to link both gsx packages in the Addon Manager\MSFS folder to the Community folder.