I am no longer in the loop re: Iranian SAMs, but their primary defense was the Rapier, which topped out at about 10,000 feet.
The Russian S-300 variants Iran has obtained over the years (from Soviet client nations and, more recently, from Russia), however, can reach out and touch these planes with little problem.
The Grumbler (as they are called in Israel) is a very potent SAM.
They are self-contained and require little maintenace, making them ideal for muslim nations (that tend not to take care of their equipment).
The newest ones have some amazing missle-contained radars that threaten Stealth aircraft.
A massive attack, with drones overwhelming the SAMS (getting them to fire) would be in order.
I hope the Israelis will be able to produce enough drones to overwhelm the Iranian SAM’s like you say.
Has Israel not been able to make smaller-sized drones (which would be more difficult for the SAM’s to hit, possibly???), or would decreasing their size defeat the purpose of needing more firepower to use against Iran?