Shouldn't it be a non issue with a small amount of communication?
One Dancer uses Tech Step, Second Dancer waits out the Duration and uses theirs. Now your recasts are offset and shouldn't happen at the same time.

ASTs have the same problem with Divination and Cards in general. Pretty sure Monk Brotherhood is the same. Dragoons, SCHs etc. Everyone has important buffs that can overwrite each other without some communication.

Talk to people.