I don't think the well-lit observed vampire cooling effect violates the 2LoT, does it? The entropy is being carried away from the vampire, but that doesn't mean entropy is decreasing universally-- just that we're pumping the entropy elsewhere via R- and S- photons. Local decreases in entropy are the only reason we're all here, anyway-- we pump entropy elsewhere in order to organize our cells/bodies/planet/solar system/etc.

As for the absolute zero issue, I suspect that once the vampire hits absolute zero, the energy would have to come from mass, which explains why a vampire might crumble to dust in direct sunlight-- they begin losing mass to extra photons, and you end up with structures that can't sustain themselves anymore and collapse under their own weight. At the extreme case, I suppose either you'd end up with a pile of bits that is no longer a vampire (and thus the process would halt) or the vampire would dissolve entirely into r- and s- photons.