Maybe? Keep in mind, you'd want to delete the values for the relevant variables, not set to 0 or any other number. You also probably should reset Chief Neykkar's variables as well.
If you're unsure what you're doing, remember you can save the edited file in a different slot than the one you loaded. It's probably a good idea to do that anyway. Also you'll need to use the TisTheSeason (caps for readability) cheat to allow the Kashima Incident, unless you want to wait for next October.