Look outside of their ECW ranges. You can pack out a unit with some medieval or ancient figures.
Look for ones in tunics, even bare legged, as you can paint the legs as trousers. Cast in spears
can be bent into scythes, or flatten the end & cut it into fork prongs. Medieval Bills are/were
based on agricultural tools stuck onto poles. Still works for ECW rabble.
Also try Irregular miniatures. Even if you don't find what you want, it is worth having a word with him.
Some years ago a friend asked if he planned to do any wagon guns for Hussites. He got my mate
to send him some drawings of what they would look like, & cast them up for him!
When I started doing AK47 I didn't notice that as well as the 'Army' you needed to have models
for the things you MIGHT get due to the Political bonus system. I needed (quickly) a lot of rioting
thugs. After consulting another friend with a similar army, I padded the mob out with just about
every spare 15mm figure I had. Look closely at my mob & you might notice:- ancient archers,
medieval peasants & even the occasional Egyptian chariot crew member!