I also didn't do such thing but I will say my opinion/tips to it.
If you want to use high-flanking pet like eagle or bog-lurker and you have 4 pieces of hytbold animal set, you don't really need improved innere flame. I would take hardy companion.
For the last two slots of traits I would probably take fast loader and improved S.o.P.: Command. You have so +2 target on bane flare, you can so daze/interrupt ranged enemies without problem. The champes will have a little bit better dps because of improved Command. I am not sure if it is still possible to daze lieutnants in 3-man skirmishes. If not, then I would take something else instead of fast loader. Maybe also tar but I am not sure if it will be there enough time for running around. From melee enemies you shouldn't get aggro because of aoe from champs and kite because of ranged one it sounds not good.
If you will use air-lore (probably yes because of trait) you can have a little bit power problems, even Power and Wisdom could be nice. But this depends more on players. Have you enough icpr? Have champs enough icpr? Without captian many players have power problems. And in long fights like this skirmish it can be a real problem.
For legendaries, I would take S&S, eagle, bog-lurker (pet summoning in combat). Ents make not much dmg if not red traited. Aoe Stun could be nice, but you have bane flare - first 5s daze can't be broken.
Ich bin kein Deutscher, sorry für Grammatik
Eglish isn't my first language, sorry for mistakes