I think Ukraine will blow the Crimea bridge before long whether they get the rockets or not.
Russia has poured billions into that bridge and blowing it would be a huge humiliation for Putin. And it would reduce the arms flow into Crimea and lessen the chance Russia can take Odessa.
Targeting that would make a lot of sense but the Ukraine may not a\have the capability to get bombers there and past Russian air defenses.
Now if they could get a truck bomb up onto to the middle span....