With your demanding schedule, there is really no dog breed that is going to adapt to your current lifestyle. Dogs are social animals and need stimulation; if you are away that many hours then he is likely to develop behavioral problems, and you will regret even getting him in the first place. A French Bulldog will not bark excessively, but he may dig, chew things up, or urinate and defecate everywhere.
You have already found a perfect pet that can be left alone for a long time: the cat. I do not know if you like reptiles, but they are similar to cats in that they can be left a long time too. Many of the animals that do not require a lot of social interaction (like a guinea pig) would be a better choice than a dog.
I do not mean to be the bearer of bad news, but when you have a more reasonable schedule, a dog would be an okay choice. For now, I suggest you be glad that you have the cats to share your life.