Sorry for not having that option available from the start! It is now turned on so anyone can split their payments for their pledge!
Thank you to those who reminded me of that in the last update comments X3

Also! Even though the potential stretch goal poll isn't closed, it seems there's an overwhelming majority on the Gummy Shark option! 
I was thinking more, and I may add it as an add on, and as long as around 15 people back for one, they will just get made! I may also just add the "unlock this item" goal in the survey! I may also add some of the other ideas as a "add to unlock" 
(As long as there is enough interest and enough support, I'll just get them made!)
I attached a new poll to gauge how many would add the gummy shark to their pledge if I opened that one now ;3