Answer to the new question :
I don't know any "automatic" method for what you ask. I'm afraid you will have to do it manually.
To be sure that you won't lose anything, you can do the following (no subtlety here) :
- Copy the cr2 images in a new folder ("B")
- Import this folder into Lightroom. You have now 2 folders : "A" with the edited images and "B" with the new unedited ones.
For each image of "B" :
- Select your edited version in "A" and copy the modifications you want to keep (CTRL+SHFT+C on windows).
- Paste those modifications to the image in "B" (CTRL+SHFT+V)
Finally you can export the images of "B" for your paranoid client... and get a beer and delete everything of "B" to save space.
Original answer to the original question :
In the export options, setting "Format" to "Original" should do what you want : it will export your pictures as they are on your hard drive.
Exporting "original" picture (meaning RAW to me) while keeping some modifications from Lightroom seems impossible, they are not "original" anymore.
If you client use Lightroom, you could try to export "original", which come with a .XMP file containing your modification. You could then try to edit the XMP to keep what you want, as XMP are in the XML format (human readable). More information on XMP here : https://helpx.adobe.com/lightroom/help/metadata-basics-actions.html
You can also give him DNG exports and tell him those are the originals...