Also, .gwbk files are just renamed .zip files. Any tool that can read a zip file can read a .gwbk, and 8.X projects are plain files directly inside the zip; should be relatively trivial to script an extraction job.
Once you've unzipped a project export in the data folder, do you still have to wait for the Gateway sync/scan time to pick up your changes? I think the current default is 300 seconds.
Is there anyway to force it to re-scan immediately?