Hi Jeff, clown trigger would be an awesome addition to your tank!
I had two clown triggers in the past and they have been very chilled and were VERY passive.
It would even leave my chromis alone when I had chromis in my tank. I also feed heavy so that may be the thing there but I got them when they were extremely tiny. (quarter size for like $40)
They grow quick and imho, it's better when it's smaller so you can see the growth, for it to get used to your feeding better and it's price.
No lions like you said since they do tend to nip at the fins.
I do have my tangs with the clown and they get along really well.
Say goodbye to your cuc lol.
Aggressive tanks are cool and easy to maintain because these fish are generally super hardy.
Also you can get the red corris wrass that you always wanted!
I saw one at my lfs for $20 this Sunday and was thinking about you buddy.
Let me know what you planning!
Richard.