Good idea... But if we don't have any fire?
Okay, here's my answer: Let's say that with the threat of war on the horizon, many mages (fearing the rise of dangerous plagues and diseases that break out from bodies lying around on the field) have come together to create a special ring that soldiers, adventurers, and anyone who would see war or battle must wear. They are required to burn all bodies left behind as a mandate, and if you perform your duty well, you are rewarded with a small stipend as a reward for keeping the Empire safe from the spread of disease. The ring itself monitors how many bodies you've burned to monitor how much of a reward you get, but it won't be much either way. If you don't burn any bodies with the ring, despite coming back rich from the "spoils of war" it may indicate you are not doing your part, and you may be fined instead.
Problem solved. And within the confines of the story arc, and the small amount of money helps offset the tedium of having to actually run over activate the ring to burn the bodies.