Forum theatre with topic selected by participants?

The description of the forum-theatre methodology for learning the sources describes the use of a topic.

I am planning to do such an experiment/learning process with my students (organic agriculture bachelor), but would like to use it somewhat differently - in part because it needs to be split into phases according to classes (e.g. preparation on one class/between classes, theatre on the following class, maybe with larger audience).

A few questions:

1. did anyone ever use this with other topics?

2. does it (pedagogically) make sense to let the learners learn and become the actors for the sources of degrowth? In this case the other actors would be people from the general public not necessarily involved in (other) degrowth learnings

3. does it make sense to let the learners find themselves a topic for the theatre?