2H FW should be the quickest. But I have leveled a few oathkeepers to 60 with just vires might and guardian of empyrion. Boss fights can be slow but the rest is pretty easy. Drawback for you if you wanna go with that is that you need fire devotions for such leveling, wheras the final build you need the physical damage devotions. There was some discussion here about leveling warlords: Warlord - Blade Arc vs Judgement for S&B Levelling (no Forcewave no EoR) but if you have played around with FW you should try it, it is a classic skill
do you own experience potions and difficulty skip tokens?