I found a quick solution. While lunging on plutonium indeed remains in the files, the issue with lunging is actually rooted in BO1 as a PC application. When you start the game and the controller is connected, while gamepad settings is switched to enable in settings, lunging will be disabled. Go to settings, and disable the controller, and like that, lunging works. You will need to use K&B, but I just mapped my controller with DS4 to emulate a K&B and got this 'lunging' profile set up.
I hope this can be useful to somebody