Why not merely "save as" when finished with edits in CS6? Name it anything you like.
I do this routinely. Sometimes entirely new name, sometimes suffix to orig that is meaningful re edits.
Added note for clarity - when you do as above, the file name of the round-tripped file appears as you "saved as" in CS6, in LR. No need to name change from within LR & less confusing IMO. Most often "save as" is used when saving as a new file type, but you may just leave as tiff and only change the file name.