tranquil totem
Basically have it so you can use Excess Rainbows or Yellows and can transfer/craft other fruits with them.
Kinda like this:
Rainbow > 2 to 3 of any color
Rainbow > 5 yellows
2-3 Yellow > any color
5 Yellow > Rainbow
Would just allow if you have a ton of excess yellows or rainbows for the ability to just get the ones you want/need.