Doing a “forced” introspection is a little bit of a non-sense, because the intensity of the “trying” can cover the real emotion or topic to be investigated. I usually introspect when there is either clear topic or emotion or when my therapist gives me homework. And also, if you leave me a response in the comment on what would you like me to introspect, I can consider doing this! I’m very open to your input! If I don't do introspective writing I rather go for creative writing or I just plain journaling. But if you keep track of the issues that come up in your life, usually there is something to tackle. So “disciplined” or “controlled” introspection doesn’t mean “forced” introspection. And yes, you can put yourself in the mood for doing it, the mood doesn’t have to “be there” all the time.
"You can have a chocolate ice-cream".