In a 46 it would have to be as a temorary only as all would eventually outgrow it, but then again so will your tangs.
When tangs outgrow a hobbyists system it's usually no biggy as many to most LFS will take them back in trade if healthy.
Triggerfish can be another thing altogether with larger specimens of some species almost impossible to sell in many local areas, leaving you stuck with it unless you find someone willing to take it later before you make the purchase.
On the other hand, some damsels are aggressive enough to kill small new introductions with many people ending up wishing they'd never bought them to cycle the tank in the forst place.
My fish of choice for cycling a tank is mollies, far better and tougher (condition-wise) than damsels.