As Sushant mentioned, the idea of exporting/changing/importing is a hack, and the tampering warnings are there indicating that there is no support for a scenario like this. So you can try to - very carefully - edit the exported files but don't be surprised if this doesn't exactly work the way you expect. Just like copying a flavor from one transaction to another via a hack... there is the caveat.
Regarding the Screen ID overwrite entries - actually that's an interesting idea and it MAY work. It is not intended for such purposes but the way I see it, it could perhaps help to resolve this; it should be tried.