Slow down Allikat, there isn't a territorial dispute yet. Don't look for trouble where there isn't any yet.
If the project staff can keep emptying out the nesting material the ravens will probably give up out of frustration and move to a new site before the peregrines turn up. They have the same nesting imperative as everything else and if it looks like this site isn't going to work, then they will move. Its a quick, simple, easy fix with no danger to anyone, except maybe from climbing all the stairs to the roof with the nestbox.
I've contacted the U of A folks as they seem to be the ones watching over the box. I've also sent an email to the provincial wildlife agency in charge as a back-up.
Think happy thoughts Allikat