My suggestion is to allow players to remake their current characters as Vampires or Rakshasa. This would still require an approved application, normal -remake rules, the usual award, and that the base race making sense (no-award race for Vamp and shapeshiftable for Raks).
I understand why there are no race changes allowed on remakes, for story consistency and such, but the idea of a PC being cursed with vamparism (willingly or unwillingly) or having their life stolen by a rakshasa is a really cool idea. As it stands now, there is nothing that stops you from this being your pre-Arelith backstory, but that means the only way others get to engage with this concept is if they learn about it and nobody gets to experience RPing through a friend/family being turned into a monster.
I think it could be a really cool option to offer to players, and with the need of an application any potential abuses are more easily weeded out.