Those figures are awesome! I'd say keep them all and set up a Napoleonic skirmish game with them. You'd need some French (blue uniforms
), and the rules could be from Too Fat Lardies' Sharpes Practice which could be good.
For me ... I have old fantasy roleplaying figures from the 1970s, 58mm plastics and Britains for Medieval, AWI, Alamo, ACW, WW2, and I have 15mm AirFix Napoleonics and a few Celts too. Maybe some day I'll paint the 15mm Napoleonics or maybe the 58mm ACW. Maybe.