Assuming Napoleon had stayed in power, with a PoD in 1807. Via diplomacy Napoleon / sanity Napoleon maintains the status quo generally. Doesn't back stab Spain or have the 1809 or 1812 wars.
At some point the British will have to accept some kind of peace with Napoleon, though this could very well take a long time. But after peace does come, it would be logical to assume Nappy gave up north Germany and perhaps Holland ( no more reason to hold these areas after the continental blockade ends ). As for holdings in Italy I am not sure about the potential of him giving stuff over to Italian puppets.
I am not sure but I suspect the French industrial core would be around the Rhineland/Belgium/North Western France due to the massive amounts of coal from Limburg, the Rhineland, and Belgium.
Historically France lagged in terms of industrialization, I think you would likely see much more industrialization than historical.
If it happened in the areas I suspect this could have 2 interesting side effects:
I: The Rhineland and Belgium become Frenchified with new workers moving to the factories.
II. The Brith rate goes up, iirc one of the historical reasons the French birth rate was so low in the 1800s was due to lack of mass industrialization. Potentially this might mean a France with much more manpower long term.
So my questions are:
Would this additional coal fuel much stronger industrialization than historical, or were French shortcomings due to other factors?
Is it likely the area I suggested above becomes the industrial heartland of France, or is industry focused elsewhere for other reasons?
If France has such an alternate industrialization, how much is population growth impacted by it?