If you're planning on using Battleforge so consistently, I'd suggest Leather Boots and Regrowth Belt. It's nice to have more options to use it for, especially when some of those options are cheap like Leather Boots. I'd also suggest a Mage Staff as a way to deal with incorporeal creatures and to give you a flexible weapon that isn't weak to fire resist. Sectarus is certainly nice, but I'm not sure if you'll be able to support the mana for both it and Battleforge early, and I'm not sure whether you have the expansion.
I'm not a fan of Deathlock, since I prefer the Warlock's healing to direct healing effects anyway. Vampiric is just so strong.
You might want a couple of Fireblasts so that you have a few unavoidable attacks to burn through Blocks and Reverse Attacks while keeping the damage up. This also allows you to kill Huginn and Fellella easier, and you will need to kill them.
Your creature selection is minimalist, but those are probably the 2 best creatures for a Warlock in a vacuum.
I haven't tried this in a game yet, but Rouse the Beast seems like a good choice if you're planning on summoning creatures later, once you're in combat.
I don't find Maim Wings to be particularly essential. Lash or Mage Staff gives reach and Vampiress can fly if you want anyway.
Reverse Magic seems overly expensive for you to include.
If you have the expansion, Falcon Precision is probably better than Piercing Strike.
Personally, I'd switch one of those Seeking Dispels to a Dispel. That depends on your meta though. It helps to have multiple Dispels against other Warlocks that rely heavily on curses and against Forcemasters, particularly if you plan to ever use those creatures.
You could really use a Mongoose Agility.
Your build is really focused on shutting down swarms. Do you really need Mordok's Obelisk, Suppression Orb, Idol of Pestilence, 2 Rings of Fire, and a Firestorm? All of that plus the damage barrier on Demonhide Armor seems like overkill.
You seem very vulnerable to weak conditions. How do you plan to deal with Gorgon Archers?
As for your plan, your opponent can hold off on using Dissolves and save those for Mage Wand and Lash. None of the other equipment you include are particularly problematic for the Priestess. You are focused way too much on anti-swarm if you're primarily concerned with beating the Priestess. It really depends on what the Priestess does, but the biggest concern for this type of strategy against a Priestess in general is getting daze/stun locked. Between Staff of Asyra, Temple of Light, Angel of Light, Angel of Lightning, and Pillar of Light, you can be facing many daze/stun chances. Add a defense and Temple of the Dawnbreaker you can find yourself at a severe action disadvantage.