What we can do in SharePoint Online is like below:
- Create a QR code for sharing files. Scanning this QR code will always redirect user to the lasted saved version of the file. I tested in my end with Office files and it works.
- After creating the QR code, we can simply copy&paste to other files, so copy&paste it to a office document is doable.
So I think the sharing QR code shall works as you expected.
For How to create the QR code, please follow this: http://stephkdonahue.com/office-365-know-blog-2-qr-codes/