Vertex paint both sides (visibility culling creates ugly artifacts in vertex paint mode)

I want to paint the tips of these leaves in a vertex color, and I want the color graidents to be smooth.

Front:
https://imgur.com/wTFr0Bj

Back:
https://imgur.com/BdI32Vm

Gif:
https://thumbs.gfycat.com/AlarmedLateGrunion-size_restricted.gif

However, because of visibility/backface culling I get these sharp ugly artifacts.

What I want is basically the same effect as when toggling the ‘Z’ key in edit mode - ie the editor becoming agnostic to what’s in front of what and facing what way, making the vertices just a point cloud where you can edit all of them.

Have not been able to find any solution, except perhaps one thread that alluded it’s not possible. Surely that can’t be the case?

This?

Ah, so just update to latest version then? I’m on 2.79 so I’m hopelessly behind I suppose… Anyways, thank you, will go ahead and download.