Have an entire "hardcore like" season where everyone who's running the event (both the light and perma-death versions) has to play a Kobold to take part in the event... That would be a heck of a cool way to introduce a new race.
I have a better idea for a hardcore, swap the player & monster races - Savage Species or Volo's Guide to Monsters should cover all the stat blocks needed for character gen.
But definitely a proper HC server would be brilliant to add a new race or xpac etc