Reading pixelsfrom ARGBHalf render texture

Hey guys, I've found out that render textures support an half-float format. I can render to a texture using this format but now I need to access its contents and output them to a file for external processing. The tradional way to do this would be to copy the image to a Texture2D using Texture2D.ReadPixels, but unfortunately Texture2D does not support the half float format and so the copy would remove the HDR from the data.
So, how can I get the pixels from a render texture that uses the ARGBHalf format?

 

Basically, you can't

Their purpose is primarily if not only at the time for usage in shaders (post fx - shader replacement)