There are probably several vital details. Tell students to identify the expository detail of their choice and write a paragraph description of how that information might be made dramatic. Allow students to find a partner for collaboration. They should discuss their respective papers and decide which they will dramatize. Allow the students time to write a script for the scene of exposition they've chosen.
Pairs become foursomes as before and record their scenes.
Since the class has agreed in advance what details of information were critical to the climactic resolution, your concern should be the degree of originality demonstrated in dramatic approaches to that information. Of course, use of plants, tagging, or other fundamentals of radio dramatics are absolutely necessary.