Lorewise you are correct since Lunus see bipeds as slaves and Helians see bipeds as things that require guidance to not become extinct. However if you take a look at the stats that are increased by finishing (A)RoP, as well as the hatchling only quest scales they clearly show a tendency to “dump� the biped friendly Helians towards magic and Lunus towards melee.
Depending on which mobs you are talking about Flame/Ice or Energy might make quite a difference as well as Cloak of Thorns or like half a dozen other biped gifts and enhances and also the primal health spell can be quite potent. So yes I guess it should indeed be possible with a mega load of biped buffs, however with dragon-only buffs I doubt it could be as easy as you wrote down here.