Yes, machetes are made to survive heavy chopping (Trees, Zombies, crocodiles) and are probably at least twice as thick as a typical handsaw. Go to a junkyard and get an old leaf spring, probably a car one rather than heavy truck. Cost should be pretty low as a part, much lower if there's an odd one of unknown application in the scrap pile. A typical leaf spring should have enough in it for maybe 4 machetes and a whole stack of Bowie knives.
The leaves can be straightened, too...lay leaf on two chunks of steel maybe a couple inches apart, move back and forth repeatedly whacking the part between the two anvil blocks until straight.