One of the important things about your particular work is that the one overlying context from a disparities perspective is the fact that girls involved in the juvenile justice system are most often from groups that experience health disparities, in addition to the fact that first generation research has found that this particular sub-population experiences even worse outcomes. I agree with your assessment that your work investigating how to meet their reproductive needs is second generation, leading clearly into plans for interventions.
The community engagement piece of the barbershop program is powerful. Further interventions designed to take advantage of similar place-based and social communication strategies in different contexts will definitely need to do work, similar to what you are doing, as well as engage with community partners, to understand the specifics of that context and ensure that these types of interventions are appropriately planned (i.e. don't take a one size fits all approach to this type of intervention).