Oh I'm on-board :) Though I think she'd sell better with Kowl - let's save Imp as the Filmation Hordak accessory, shall we?
I would love to see Catra's Magicat form made, I think it's cool that she can turn into her own battle cat! I feel that using Cringer as a base would be both too small and not quite the sleek body type. Cringer's neck is too wide. At the same time, a full beast slot would be overkill. Catra shouldn't be as big as Battle Cat or Panthor, that would be more suitable for Clawdeen.
Instead, I'd like to see a new, articulated Magicat body that's only slightly bigger than a standard figure. Call her "Fright Zone Catra", put her in an Orko box with Filmation Imp as a pack-in, and I'm sold!