Yes, Copplestone Partizans can be easily transformed to such figures.
The weapon partizans. In Siberia for that period for a long time there was no war, there were no considerable stocks of the weapon and an ammunition, there were few imperial military units. Therefore the modern weapon in this region was not much. The Siberian inhabitants had a lot of the hunting weapon (many woods - a lot of game). Peasants preferred for hunting flintlock muskets as could do gunpowder and cast bullets. When operations have begun - the hunting weapon became the basic fire-arms partizans. In due course there was a lot of a modern weapon as trophies. There were many deserters from army Kolchak, passed to partizans with the weapon (sometimes the whole regiments).
But the fire-arms did not suffice and about half guerrilla have been armed by a cold steel - basically lanse, axes, and sometimes hay forks and simple cudgels. Manufacturing of self-made grenades has been adjusted. Self-made guns (!) became or guns of an epoch of the Napoleonic wars, removed from old Siberian fortresses (!) were used.

So in game it is possible to use groups lansiers, musketeers and ancient artillery! Actually army of XVIII century!