How to delete the Input.txt remappings and reload the Config/DefaultInput.txt ones in runtime?

I have finished my action key remapping widget and all works as expected, but now I want to make a button to restore the action mappings to the default settings. I’m saving the remappings using the the function: UInputSettings::SaveKeyMappings() that generates an Input.txt with all the user remappings.

How can I “delete”/remove the generated user config file Input.txt and reload the DefaultInput.txt in runtime?

Thank you!