Media img Sequence colour correction

Hi there, I am looking to put some pre-keyed green screen into unreal sets. I can import as an exr sequence fine however the colour correction for the plate image is minimal. With the CC node available i can change hue contrast and exposure but i wish to go further. Levels, curves etc or ideally a colour match node to match the plate to the environment. does anyone know of anything that can be done here?
thanks in advance
All the best
chris