Personally I agree that Black Powder or Sharp Practice might fit the bill. i personally like this scale of battle, a good fit for the AWI thinking Cowpens and similar battles, But also think the French rearguard during the retreat from Moscow.
Personally I dont think you would get a game with British Grenadier in 2 hours, they are great set of rules but I havent had a game yet we could complete in a nights gaming.