I am planning something similar, but with units set up like in Mighty Armies, where a
KoW "troop" is three figures on a 25mm x 50mm cavalry base, so two or four of those can make regiments or hordes, respectively. It'll give more of a feel about halfway between skirmish and full army scale wargaming.
Like in this pic of a Wood Elf force (not mine) using figs from Splintered Light Minis.:
At this scale a 2000pt army can be had for under 50 dollars.