As far as I know, the only way to get Lightroom to show you the original image in the Library Module is to create a virtual copy of the original, and then organize those somehow. I don't know if there's an automated way of doing this ...
However, if you want to export the originals of photos that have been edited, that can be easily done by selecting the edited photos, and then asking Lightroom to export as Original (which means, don't use the edits to make the exports). But this fails if the originals are RAW and you want JPG exports ...