Unfortunately it should be nearly impossible.
The game cannot factor in the political concerns of the different nations that napoleon was counting on.
If he beat Prussia, wouldn't Britain abandon them and fall back on the ports like the British character had always seemed to be?
If he knocked back the Prussians and British, wouldn't Belgium and Holland change to his side?
At the Congress of Vienna, France, Britain, and Austria had just signed a treaty that was effectively against PRussia and Russia. Napoleon had reason to hope that Prussia and Russia would be less than enthusiastic about allowing that treaty to flourish when napoleon was beaten again.
Austria, as usual, was in no hurry to throw itself at the French. They were not advocates of total warfare and their presence on the borders was mostly, I believe, a show. They had little heart for marching on Paris and would have been willing to negotiate if Prussia and France were beaten, especially if there was animosity from the Prussians because of it.
Almost nobody was planning an aggressive assault on France, I don't think. I expect that the allies were really thinking that if they could mass for an invasion, France would throw Napoleon out themselves when he had nowhere to go. That was a cleaner solution than bringing about the deaths of tens of thousands of people.