Not sure what you mean with conserve.You can try the Filter with Agx or other tonemapper and you can see how it looks.
Typical these filters are as gel filters with lighting (like you setup) or in front of the camera lens.(you can simulate this to use a plane with transparent shader material in front of the cam).But for image grading maybe its best to do it in compositing if you want to try different filters.
I have made my own testings to get the “Ring” movie look.with these filter transmission values used in the movie.
Notice i have pre multiplyed the EXR file at the beginning.This is important to simulate that the filtered light intensity gets afterwards tonemapped like with a lens.
Vs.if you filter you image at the end,then the whole image even the white highlights are filtered,if that makes sence.