You could use Registrator Viewer to save out the bit of footage you want without the metadata which would remove the subtitle stream from the video, and then you could crop that in an editor?
I run a Mac so I've been using DashCamViewer. But I'll load registration-viewer on my wife's windows machine and try it out.
But it would be nice if there was a firmware setting to include the GPS-bar or not.
And, optimally, keep the GPS data in a separate file from the MP4. Then, in the accident scenario, you just hand the police the video file at the scene of the accident.