Hi Aslan,
I'm living between Paris and LA. Never had any trouble with exposed film (BW). But I understand your issue, it's only a feeling between you and the security guy. He can be a pain and will certainly not speak english...Like in LAX, the guy will not speak french and be a pain too.

Just pray the guy will like photography !

If you want to buy film I can give you plenty of adresses in Paris.
No problem for the tripod either. If a problem occurs (really if ),just pretend you are a tourist. That stuff is only for big shooting.

Enjoy and if you need any advice, adress or contact, let me know.