Is there a way to "project" colours onto a mesh via vertex paint?

Hey,

Basically I was wondering if there was a way to project colours onto a mesh via vertex paint in blender?

Essentially I want to project a rainbow onto a pixelated halo smoothly, however I think I’d have to do this by hand.

Here’s what I have currently:

Ideally it would be smoother. Currently, when imported into studio, it is very blotchy (for lack of a better word), especially on the warmer colours.
image

Any ideas for automating this process or at least reducing the amount of time I have to spend?

TIA for any help!

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