This is almost feasable - Armies in Plastic do some nice sets like British lancers, Germans in pickelhaubes, Uhlans, all suitable for floor or garden wargames, but some omissions exist that need to be rectified. No one is doing French in kepi/capote unless you count the annoying plethora of Foreign Legion figures out there and nobody does British in caps though AIP do Indians and Highlanders for the period. Artillery - Emhar do some guns in 1/35 scale which are a little bit small but possibly useable.
Russian infantry and cossacks are also in AIP's expanding line of figures.
Landships forum has a piece on available artillery for this scale
Des kits do a French 75mm.