Photoshop is lacking False Color any workaround?

False Color, Vectorscope and other Scopes in Photoshop... Why not? And Histogram in Bridge...

There are ways to set up adjustment layers (especially using gradient maps and LUTs) to provide a sort of false color evaluation of an image, but of course it’s a workaround. I haven’t used those techniques, but you can do a web search like “false color photoshop”. False color is one of many color correction aids that are very useful in video, but not in Photoshop because it started as an application to support print and then web workflows. 

For example, there is a long-standing feature request to add features such as RGB parade and vectorscope to Photoshop, and even though these provide much more useful color correction information than the histogram, it hasn’t been implemented. Probably because print and web designers aren’t trained to understand them.

If no one has submitted a feature request for building false color into Photoshop in the Ideas section of this community, you can submit one there and see if people vote it up the chart.