I would adapt those Corps as something other than Corps. For most of them, just keep their leaders. Star Sapphire would probably remain JUST Star Sapphire. Sinestro might need a traitorous Oan to help him start his corps, but other energy wielders like Atrocious, Saint Walker, Indigo, and Larfleeze wouldn't have corps with them. And honestly, even in the books, most Corps are irrelevant beyond their leader, Sinestro's was relevant only for a short time, and mostly because of non ringslingers like Superboy Prime, Hank Henshaw and Mongul. I personally would make the ring slingers of Sinestro's Corps relevant. Ranx, Arkillo, Fatality, Amon Sur, Evil Tomar Re-looking guy, all that. Maybe even have Larfleeze and/or Atrocious start out in the Yellow Lanterns. Could be fun.