The more I read your story in your two related posts, the more unbelievable it becomes. or let's say "crazy" to use Goldorak's word.
You mention an 8 hour transfer between CDG and ORY. As the last LCY flight departs around 5pm, that means that you will arrive on AF7 (the antique A380 F seats). If you MUST use that LCY flight, it probably means that you had bartered an award and cannot change the ORY-LCY. But it was truly "crazy" to get it in the first place. A direct ATL-LHR in DL J with a nice flat bed would have saved so much time and fatigue. Even if that is a nonchangeable paid ticket at dirt-cheap price, that was really a mistake.
If you bought a return ticket, then you are now stuck. Why don't you rather enjoy a few hours in Paris, especially as you have only hand luggage (although probably heavy one).