This is a short idea of how your helper file can be improved. We've already merged WWise into our sources. There were some problems, but we made it quickly.
One idea regarding your chm instruction: "Wwise Unreal Integration" -> "Using the Integration" -> "Initial setup", sentence:
"This path is relative to the game's base directory, as given by
FPlatformProcess::BaseDir() in Unreal Engine."
This suggested me that game directory is the directory of "%gameName%.uproject"'s file, but no. Game directory was: "%path_to_UE4%\Engine\Binaries\Win64". It would be nice if you add a few words about this, some others sould have problem with this.
Finally, my LinkedProject parameter was equal to: "../../../%gameName%/UnrealWwiseDemo/UnrealDemo.wproj".