Adding DOF from Console or Ini?

Hi friends! Been banging my head for a while on this one. I want to take some test footage in a shipped UE4 game that doesn’t have Depth of Field by default. I would like to add DOF and have access to the console and ini files, but that’s it.
I think I’m close by using overrides in an ini, but I can’t get my defaultpostprocesssettings.ini overrides to take. My defaultgameusersettings.ini stuff works just fine.
A million kudos to anyone who can help crack a solution.