Take it for what it is worth, but I can give you two personal experiences with queen triggers - the only two stories I know that are not second-hand, and they are both positive.
One was the guy I bought my 180 from, his inhabitants were a 14" queen triggerfish and an approx. 14" volitans. He also had some other smaller fish (a 6" queen angel the most impressive among them) but the queen and lion were housed together for years and he never had a problem.
Second one can still be seen at Tropical Paradise in San Leandro, California. It is about a 220g with close to ten fish. 8" clown trigger, about an 8" niger, 8-10" porc puffer, some BIG damsels, harlequin tusk (I think), and a couple others - including a 16" (minimum!) queen triggerfish - bigger than your head when it cruises by. NO problems - the fish came from one of the customer's tanks they maintain because it got to be too big and that owner never had problems either.
If you live in the bay area stop by and see it or talk to them about it, quite impressive.
So I definitely think that there is a chance the eels and queen could co-exist. And I doubt the trigger would kill them outright, so if you noticed damage or chewing or whatever you would have a chance to remove the trigger.
2 cents...
bb