Yup, you can listen to Rizon FM via DSOrganize!
Download the special RizonFMDS.zip file here, (you can also download this file while using DSOrganize(no, it's not a virus)). Place the Rizon.FM folder at the root of your flashcard, and place the RizonFM.dss file in the /DSOrganize/HOME/ folder. Then go back to the menu and press the R button twice. There you go, press the Rizon FM icon and enjoy listening.

* You can only listen to it when someone is DJing, check #Rizon.FM @ Rizon to see if someone's DJing!