What if Napoleon has to share power? Not like democratically, but if he was the front man for a ruling clique? I'm imagining something like the SCAF in Egypt, its a dictatorship but not of one man. Would that be possible, and if so who would else would be in it. Could any of the candidates be a voice of reason?
Well, the Consulate which existed between 1799 and 1804 (when Napoleon declared himself emperor) was essentially the system of government that you describe. Cambereces (responsible for much of the Code Civil/Code Napoleon) and Lebrun served as the Second and Third Consuls, and continued to have influence following Napoleon's coronation as Emperor. Indeed, Cambereces served as de facto Prime Minister while Napoleon was on campaign, and had warned Napoleon against going to Russia.
By my reckoning, Napoleon could have stayed in power had he maintained better relations with Russia in the aftermath of Tilsit since there was no real contradiction between French and Russian foreign policies. If Napoleon confined himself to west and central Europe and allowed Russian influence in the east (perhaps even at the cost of Poland), it would have been difficult to challenge the Franco-Russian alliance in the continent. Of course, the question remains whether British naval superiority would have succeeded in the long run, or whether industrial development within Napoleon's empire could eventually catch up and meet demand.