Even if it was financially viable to repair the car, in France, the resale value would be minimal as the car is not registered in France.
I do travel to France regularly and I am going there this week, but I never go anywhere near Paris in a car, if I can avoid it.
You have an interesting connundrum, but there is only one solution, scrap it. I wonder how you go about that in France given that all vehicles offered for recycling must be documented? You may qualify for the French car scrappage scheme of E600, if it is still running.
Handyman