It may be difficult for you to brake down the BB. As for the hub brgs., a shop should have them too. I believe the bike has standard type English threading so you shouldn't get stuck with a problem. Some LBS get anxious over working on French bikes which is understandable as the mechanics don't see French bikes frequently. Particularly the younger guys. So you can prevail upon them to help if they're reluctant at first, such situations haver happened to me.
Your bike is by and large standard in all regards.
I've only ocassionally sought out the actual balls to replce, mainly if they'd spilled out an lost or if an insufficiant amount was found out the outset. If the balls show wear, the race is compromised. One could argue that the newer balls are less worn, still round but smaller, this is true but I still prefer to get complete or just lube, depends on what's handy. BTW, shops don't tend to over-sell BBs.