would be very risky as triggers may attack many different inverts. some triggers do have fairly peaceful reputations. what type of trigger do you have?
We have a puffer and a niger in with a sand shifting star. they dont seem to bug the star. althought the star does spend most of his time in the sand bed and had a tuff outter skin. Just watch them for a few days. The puffer did peck at the star a few times but it didnt seem to hurt him any. Id say go for it, its worth a try isnt it?! Good luck!