Perhaps France could keep Algeria (it was integrated to France) or leastly some areas on the coast. And if Belgium dissolves to French and Dutch states, France might annex Vallonia.
After WWII, it's hard to keep Algeria. Not impossible though, you need two things: no Dien Bien Phu disaster and a better recognition of muslims rights.
Some Muslim/colonised representation as recognition by de Gaulle of the role of the Indigènes (Tchad comes to mind) could help defuse some of the biggest issues. Because they were complete second class citizen, Algeria was in an apartheid state. Get rid of that, at least partially, and it will stay in.
Of course you need to overcome pieds-noirs résistance to the idea. Even now, de Gaulle is not a popular figure for "letting" Algeria be independant (and the whole "je vous ai compris" thing) so I can't imagine the backlash at any tentative to give arabs a bigger voice