I have several montezuma cypress that were planted approximately 3.5 years ago. The site they are planted is somewhat windy and the original bamboo support that was attached didn't last long. Now the trees have crooked leaders at the top of the canopy and are too big to re-train.

Will they straighten? Any other options? Any advice will be much appreciated.

If the wind is what's bending them, they are destined to be bent. Wind swept trees.