I would go with Planet of the Vampires I would also it to relaunch and re-introduce characters like Morlock and Ironjaw (and establish this is where Wulf is from too) and use it too spin off a new Ironjaw and Morlock series.
I would also bring back The Destructor, The Brute, Tiger-Man, Devilina, and The Cougar. Followed by one of the anthology titles like Weird Suspense, Tales of Evil, Thrilling Adventures Stories, Weird Tales of the Macabre, or Fright for some of the other characters.
Integrating Planet of Vampires, Iron Jaw, Wulf and Morlock is a great ideal.
My idea for an Atlas Universe is similar to the classic Valiant Universe (aka VH-1).
Where you have characters in the past: the Western Characters, the WWII characters, and have legacy or immortal characters (like The Grim Ghost, The Tarantula, The Scorpion, Devilina, Dracula, and the Son of Dracula) they can adventures (or their ancestors or earlier versions of them) with the Western and WWII heroes or each other in different periods in history.
They would also be active and they would exist in the present day with the present day characters The Destructor, The Brute, The Cougar, Tiger-Man, Targitt, Sam Lomax, The Dark Avenger, Phoenix, and the rest.
Then you have a future setting where Vampires have taken over the world and have future versions of The Grim Ghost, The Tarantula, The Scorpion, Devilina, Dracula, Son of Dracula, fighting with or against future heroes like Ironjaw, Wulf, and Morlock.
That is just my