I'm very much a francophile and would love to live over there instructing.
So long as you don't want to earn anything it can be done, as with anything in France the answer sequence is Non; Maybee then Pas Problem but don't upset the applecart. The method of instruction in France is quite different, you will need to be able to do it in French, unless you import your own English speaking students. Will EASA make any difference? Why should it? France try to avoid following all rules other than their own; thats the beauty of the place! Why do the English ask so many stupid questions?