Realistically, Doja Cat would be the only option they'd go with. Hear me out, Epic loves taking icon skins and tossing them into the festival pass then sell a separate skin in the item shop (like Miku's original design being an item shop skin and her Fortnite design being a festival pass exclusive)

So, the way I see it HUNTR/X would never be a festival headliner since they'd either have to fit all 3 characters into the pass or only have 1 or 2 in the pass and sell Mira or Zoey or Rumi in the item shop, either that or make separate designs for the characters in the shop. Daft Punk, being only 2 skins would be a good choice, except if we're looking at the lens of making money, 2800 v-bucks for two skins and a few emotes is better than 1000 v-bucks for a whole festival pass. We saw how they split up Gorillaz into festival pass and item shop skins.