Your lionfish or eel will make your angel lunch one day. Both can open their mouths very wide when they want to.
As for mixing triggers, I have no personal experience, but had researched into mixing different types as I have a blue throat(trying to get 2 to pair up right now). It seems like it is pretty hit and miss, sometimes working, sometimes not. It is a risk, but sometimes, depending on the fish, it can work. You do have a larger tank and the current trigger is smaller, so that is in your favor.
Sorry for not giving a more clear answer, but it is similar to asking if dwarf angels are reef safe. Sometimes yes, sometimes no, and even if it is yes, it can change in the future.
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