I'm also down with that - we have two neutral/slightly biased vamps already so one more can't hurt ;)
The Blackmoores would also not have a problem with him, because they're 100% against revealing vampires to humanity and have been dealing with rogues in NYC themselves so far (Trixy~)
Also if you wanted to, we could have a side-problem of too many rogue vampires in the city, which would require him to show up. (And also give the characters something to do instead of argue with each other all the time <3)