Concerning your questions about information about Charles, I must say most of the infos about Charles I found in the internet, before I had internet, I only knew Charles name from the table of Napoleon descendants in the book from Jean Pierre Rioux "The Bonapartes". It´s a good book, but it is only about Napoleon and his family at the time of Napoleon I and Napoleon III, but there are good tables of decendsants of the different siblings of the emperor. In the internet there are some very interesting interviews with Charles, some are quite profound, I can look for the internet pages, but you will also find them if you use "google" Often they are already a bit older, I have collected some of them.
It´s a pity I think, that I have never seen any good picture of Jean Christophe, his son, there are only some picures about Caroline, but also no picture of his youngest daughter Sophie. Any idea where to find? I wrote to him once, but I think he is too busy, he was kind and wrote that he would give me an interview, but he never wrote back to me after that.
Very good infos and pictures, but more about Louis, are in old examples of the point de Vue magazine. I have bought them at Ebay. I only have one new version of point de Vue and I must say in earlier times the magazine seems to have been much better and more profound and historical orientated than today. Now there are almost only pictures about stars and royals and no good descriptions anymore-a bit superficial in my opinion, maybe it has to fit to our "society of fun" today

I once saw Charles in a film about Corsica and I like his appearance, I must say, the seemed very friendly in this film, when he spoke...
Where did you get that he married Francoise Valliccioni only because child Sophie was coming? Is it true? Maybe, but I haven´t read it until now....