I agree with your assessment, although I am little concerned about their sending suicide attacks against our ships, and then only because of the propaganda effect working on the oh-so-weak will of too many Americans.
Like using a kamikazi 747 (full of Hajis on their way to Mecca in case it's shot down). Shades of USS Vincennes.
If Iran wants a naval scuffle, they'll get one. We could move our carrier groups outside of Sunburn range and let the carriers do their thing; bomb the bejeezus out of their missile batteries, ships and whatever else they want to light up. Sunburns have a range of what, a little less than a hundred miles? F-18s have a longer range. Our guys hunted Soviet subs, I have confidence they can find a few Iranian ones.
We don't have to play their game. They are the ones limited in their options.
Maybe I should be, but I'm not too worried about them. I don't know the propper name for them, but I call them gattling guns. I think they would make short work of small suicide craft.