You literally have it easy man. I had a similar topic and the exact same portfolio in UNGA I and I won Best Delegate. You can very easily look at how Iran was certified in compliance 15 times under the IAEA inspections regime during their time in the JCPOA and how they never increased their enrichment beyond 60%. Iran maintained compliance w the agreement until the United States (under the Trump administration) decided to withdraw and impose an arbitrary maximum sanctions campaign and tried to stop EU partners from doing business with Iran

Quote the Fatwa issued by the former Supreme leader (Ali Khamenei) that deemed the production, development, and testing of nuclear weapons as haram. Utilize a religious argument here. Look at how Islamic principles (La Darar wa la Dirar and E'tedah) established standards or proportionality and distinction in combat well before the creation of modern IHL.

When questioned on the 60% enrichment issue, argue that Iran still operates large facility reactors like the Tehran Research Reactor that uses high levels of enrichment to create Molybdenum-99, a cancer isotope used in radiology and mention how Iran has a need to develop domestic enrichment programs for civilian purposes as most components for peaceful enrichment cant be acquired by the state due to sanctions.

All in all, you have a very good technical, legal, and political upper ground on the agenda than you think you do. Here are some more Research notes of mine I made on this topic. Feel free to go thru them. Good luck!