If the United States ever goes to war with Iran, one thing is absolutely certain. Nobody gets close to U.S. Naval Battle Group. The Iranians are planning to defend the Straits of Hormuz with 1,000 heavily armed speedboats.
IRGC swarming tactics envision a group of more than 100 speedboats attacking a target, such as a Western naval vessel or a commercial oil tanker. They said 20 or more speedboats would strike from each direction, making defense extremely difficult.
If the Iranian's were not such a nasty Islamic fundamentalist bunch, I would be more inclined to warn them off this utterly stupid strategy. Instead, I'll just add that the Navy already has a name for your strategy - Target Practice.