Hi! I’m also applying to Sussex but in Development Studies MA, and my main goal is to work as a programme coordinator in developing countries.
I think you may have classes with professors also working in the IDS, and even though it is not directly in the IDS, the topic of the master’s is still in development, so I personally think it would be fine. However, this is my opinion; maybe hearing from actual IDS students would be more helpful.
Nevertheless, it would be great to keep in contact to share info on the university!