Hi, I'm not sure why you think that it is more difficult living in France. I think it's much easier than when I visit the UK.
Are your friends English or French , personally, I only find that it's the English who may eat snacks with coffee. I am a type 1 and use insulin and don't eat a particularly low carb diet but my English friends know I don't eat things like biscuits.
If you visit people regularly , then they do get to know what you prefer not to eat, so for example at dinner the other day the dessert was a strawberry shortcake, my hostess asked me if I'd prefer just strawberries.
When eating out there are lots of menus that don't include pasta/pizza or chips. One of those 400g thin crust pizzas unfortunately has 80+ g carb,
Why not choose one of the main course salads or a steak ? (often served with chips or haricots vert or salad) . Quite often the menus de jour include only small portions of starchy veg.
Buy a big bag of frozen mixed red fruits rather honey to go with your morning yoghurt I used to find these difficult to get but now most of the supermarkets have them as do the frozen food shops.
To help you work out how many carbs there are in 'French' foods , this might be helpful: (it was given to me when I started using an insulin pump but the carbs don't vary!)
http://chretiens.republicains.perso.neuf.fr/politique/sante/medtronic_aliments_&_glucides.pdf
The other thing is, have you considered using Sophia ? This their website lots of info not just on diet. Their is a sidebar leading to quite a bit of info about diabetes care and advice.
. Their advice will be mainstream, I think French advice has an emphasis on balanced meals which includes some starches but not huge portions and chosen carefully (definitely not low carb high fat though)
http://www.ameli-sophia.fr/service-sophia/laccompagnement-sophia.html