Doing the ritual at chicken pizza would be where I'd start. The most powerful and probably the most quantity of red court vampires were gathered there. Copious amounts of blood are a must. I think I would pour it down the pyramid by the truckload and cover the whole area where the red court died in it. Bonus points if you get the knife that Harry used.
I would imagine that the fact that the place has been a ritual site for the red court for centuries, it is still brimming with their power, even after they are gone. There is at least one ley line that we know of, but I'd be willing to bet that there is at least one more that is attuned to the reds power as well, directly under the pyramid. When the reds died, it happened so fast, that remnants of their essence was left behind. Not enough to revive any one of them, but after priming the site like described above, you could go for a darkhallow type ritual, drawing all those little bits and pieces of thousands of dead red court vampires into you, reviving a new first red, a new red king.
Now of course, being composed of thousands of individuals, it might have some odd side effects, but that's an even cooler aspect to play out, when there's a sudden shift in personality, because another fragment is surfacing.
And I agree with Cadd, this can just be the NPCs story, I wouldn't roll on it.