NDisplay Custom Projection Policy

Hello. I’m working with nDisplay to apply some warp and blend to my displays.

I have made two custom parameters in the Custom Projection Policy called PreWarp and PostWarp (as pictured below)

but I’m not sure where or how to access these.

I wanted to modify the shader to use them like so

but it seems like they don’t make it all the way to the shader like alpha_gamma does.

It seems like there are a lot of nDisplay files I would have to modify to pass these custom params all the way to the shader; is there any other way to achieve what I’m trying to do?

If accessing custom parameters to modify the rendering pipeline of ndisplay is not possible, is it possible to create my own projection policy that does the rendering I want? E.g.