FYI, here in Paris now, and heading to the north (Chantilly) later this week. We were able to get our CDC cards converted to EU/France pass sanitare. Mine was done in 3 days, my wifes took a couple of days longer, but she got it in time for her flight to meet me here tomorrow.
Most places here in Paris at least just quickly glance at the CDC card or pass sanitare., no one really seems to care.
Also, the United Travel Ready Center is not working particularly well for outbound US flights to Paris. My business companion, myself and my wife were all "rejected" by the Travel Ready Center for our flights. The gate agent at EWR told me that something is wrong in their system when it comes to France and Visa's, so airport check in is ultimately required until the problem is fixed