How do you edit (trim) a media library clip while maintaining G-Metrix data?

There appears to be no way to edit or trim a raw clip in the media library.  What if you leave the camera on after a ski run and record your entire lift ride to the top?  How can you trim down to just the video you want to keep while preserving the G-Metrix data for later use in video editing and creation?

If the video is 5.7K stitched, you won't want to store a 15 minute clip just to keep the first couple minutes of video and data in tact.