If the Super Early Bird rewards are still available, please don't hesitate and simply back either one during the campaign. After the campaign, I'll send out a survey built in the third party crowdfunding services, like Backerkit, Crowdox or a similar one. That would allow the SEB backers to back 1 or 2 more Abyss or Nebula cups at the SEB price from the add-ons.
If you missed the Super Early Brid, you don't have to regret either. The reward for "1 Nebula + 1 Abyss" would still be the lowest price ever, except for the SEB rewards.
Bon Voyage :-)