Your best bet would be to ask your
« curé. » He can tell you anything you want to know. (If you stump him, he’ll know where to find the answers you seek. And if even that fails, find another
curé 
)
I can tell you that the Holy Days of Obligation aren’t the same. For example, the Feast of the Immaculate Conception isn’t an HDO here. The following are: Ascension, Assumption, All Saints, and Christmas Day. And…that’s it.
Note that there is no abrogation here. The Mass obligation for all HDOs is to be fulfilled on the actual day it falls on (or with a vigil the evening before). The good news is all of these days are legal holidays in France, so for most people it’s not a struggle to find a way to get to Mass because the vast majority of the country’s work force is off duty anyway. :yeah_me:
Required fasting is something I can’t advise you on—I fast more than what’s obligatory so I don’t actually know what
is obligatory. Again, ask your
curé. If you haven’t found a church to call home yet, let me know what specific info you seek and I’ll ask
my curé.
I’m with you: since I am now under the authority of the French bishops’ conference (CEF) instead of the American one (USCCB), my obligation is to follow the directives of the former and not the latter.
Actually, you might find what you’re looking for on the
CEF website. Worth a shot.
Bonne chance ! 