Allright, as I said, Kryptonite is not Supe's only weakness. Bats has access to magic. He could use that to block out the sun. He could use it to attackSupes.
Speedblitz is def. Superman's strategy, but in three whole months, Bats could figure something out. I mean, in a week, I'd have to give it Clark, but three entire months is way too much.
Blocking out the sun? It's not like superman stops functioning in a snap, he has a large reserve of solar energies within him.
No matter what toy batman brings to the party, he's going to have to activate it. Even if it activates at the speed of thought - Superman's already thrown him into the sun.