Thank you. I am more worried about (a) that I would be flagged when I try to check in to board my flight to the US that would cause me to be forced to miss my departure; or (b) that my credit card would be hit with some fee if I don't show up.
I think I could take care of the first problem by scheduling the return to be well after my departure.
Since I plan to make it from FCO to ORY to catch the return of a transatlantic Open Jaw, I only need the O/W to ORY.