This is certainly possible today, though I guess it depends on what you consider affordable. We have grown experimental light greenish yellows (a little blue and a little yellow). Greenish yellow diamonds can also be made through post-growth treatment of as-grown yellow diamonds. I don't know if EightStar has ever cut a lab-grown diamond, but there is no reason why they couldn't if we asked them to.
Thank you Eric for this interesting answer.
For the moment I'm on another project so I don't have the budget for such a greenish yellow diamond.
But in the future, I'll probably think of it again.
A 7mm would already have the wow factor for me!