Wasn't it the initial concept for it? I can see it being sort of like red priests from A Song of Ice and Fire, but with a twist, or rather void as red priests use shadow magic. I guess it would be more or less a combination of light and darkness deity into one. I imagine this class setting their weapons on fire, using swordstaff as primary weapon. What I mean by swordstaff(spec unique weapon type) is a weapon like Staff of Parthalan in Dragon Age series. With an option to wield 2h swords and polearms,
While in lore Paladins are clerics who took up weapons, I see melee discipline as more of a temple guard, elite forces ready to defend their brothers and sisters and also inquisitors who watch closely over them, in case someone goes mad, either too much into the Light or the Void.
In fact, I don't think we should look far away. Diablo 3 offers reimagined Horadrim, they too use similar weapon as the one mentioned by me.
What are your thoughts on this idea? Would you like it to happen or rather let's keep it pure ranged caster?