You don't even need to do that. Lots of White Court vampires can pass as human. It's not like there's some registry of all minor talents in the world. Someone new comes to town, they find talents, and pose as one themselves. They could claim to be empaths or something, someone hypersensitive to emotion. Hang around for a while, and I'm sure they'd eventually be invited to join. Hell, arrange things so that they can warn a Paranet event that a Big Bad Vampire (or ghoul, or whatever) is coming to get them, and stage it so that the newcomer manages to save them all. Instant credibility and reliability.
Seriously, it'd take like two or three weeks of work and a few thousand dollars to get into a local Paranet group. The only danger would be if Wardens or a full wizard showed up, but that seems to be rare.