You can probably do it just fine, if you are really as good in PvE as you are confident. But how hard can it be to get Darkmoon Card and one another 463+ PvE trinket to get major boost over PvP trinkets? And if you just see it as a bunch of missing stats, let me guess, you probably don't even need flasks/food/potions?
Challenge modes are not THAT easy for most players, and min-maxing every buff and every piece of gear can help you a lot to get through them. I'd also like if you could keep us updated on your progress