The post-processed images works as a package tested on the monitor, although the LUT needs to be tweaked. To produce this i linked Unity and Photoshop together using the Amplify Colour plugin, exported a reference file from unity into Photoshop, dropped the red values and exported as a LUT.
I think that if i follow a different pipline in Photoshop then i can achieve a more accurate LUT with no red channel. For this i will:
export ref to Photoshop>convert to CMYK>drop the Magenta band>bump the blacks>convert to RGB>export as LUT.
This will help to remove all red channel activity that can be seen in the pink plant pots etc