I don't know much about the French Revolution, but I have two ideas for PODs.
1.Britan intervenes in the Revoltion, invading and such. No idea beyond that.
2.The Frecnh Revolution is crushed, or never happens. After the Communist Manifesto is published, the peasants try again and create a Communist France. The French monarchy flees to either the New World or Luxembourg.
So, are these at all plausible or intersting?