Production is not a hard problem. Iran, a heavily sanctioned country, already has drone production in other countries. That's assuming no other country would want to sell them their own drones to boost their domestic industry, like Turkiye has been doing for Ukraine.

Most of the Iranian drones are quite sophisticated for what they need to do. On a pinch they could replace many of the non-critical components for cheaper parts. They don't need composite materials if they were simply trying to outproduce. Meaning their production facilities could be much simpler than they are currently and still sustain enough output to matter.