I'm not sure why you're saying that France only has an issue because of Germany? Where do you get that from? Even a french power grid operator is saying that they import more power from Germany, than they're exporting (https://www.rte-france.com/en/eco2mix/cross-border-electrici...).
But you're not even responding to my main concern - that nuclear power is so expensive, that it is never competitive. Only when subsidized. And that is for power plants that are already built - not new ones (which seem to be an even greater money pit). Why is the biggest nuclear power company unable to make money in France and needs to be rescued by the government?
I'd say if it makes sense and helps us in our current situation, just subsidize the heck out of it, even if it costs us as a country lots of money. But it absolutely doesn't seem environmentally friendly, not even regarding CO2. And it doesn't seem to be feasible to quickly build nuclear power.
But yes, Germany fucked up regarding its dependency on gas (from one source and then it's even from a country like Russia).