UMG widget component - Is selective post proccessing possible?

Hi there, I am new to this forum and only been using UMG in Unreal for a short while. I wonder if someone could halep me with UMG and post proccessing?

I am currently attempting to make a world space UI screen. I am testing two possible ways of doing this:
1 using a widget component to render the screen actually in the 3D world
2 using a regular widget with a skew to fake a 3D appearance

The world widget works well but post processing is altering the color and brightness of the UI.
The regular widget colors are fine but it has terrible aliasing when skewed.

On further investigation I have discovered that the reason for the aliasing is that the regular UMG widget is not affected by post proccessing at all, including the desired anti aliasing.

So my question is this: is it possible to selectively apply post proccessing to a widget component (or even a regular widget), I only want the anti-aliasing.

I have scoured the web for the info without success, so I assume that it is not possible, but if anyone has any useful information about this I would be very grateful.

Thanks in advance, Matt