Steaming fish during shrimp boil?

So, I had an interesting idea, but I'm not sure if it's a good one!

Sometime soon I'm planning on doing a Cajun style shrimp boil for the family. It'll be a small one for 3 people, including my daughter (almost 12). Keeping it simple, water+beer+old bay, potatoes, onions, corn, crab legs, and shrimp. I'll melt some butter seasoned with a little more old bay on the side.

Note: I'm pescatarian and my girls don't like spicy food, so we're holding off on the andouille sausage. I'll probably also be cooking some scallops on the side.

So the pot I plan on using has a small colander that can fit inside of it, but out of the water with the lid on top. What do you all think about me getting some tilapia or catfish, seasoning it a little and letting it steam in the colander as everything boils? I figured there will be some really aromatic steam coming up that might give it some good flavor, but I'm worried that any juices from the fish might interfere with the taste of the main course.