Setup for Glass over Cleanplate

[BenterA]

Hi all!

How would you set up the following scene in 3ds Max/Octane:
I have to extend parts of a maschine, which will be shot in camera. In addition to some machine parts, i also have to add a glass object.
For lighting, i (hopefully) will get an HDRI of the set. But for the refractions through the glass, i somehow have to use the plate, so i can overlay my rendering in comp.
Is there any way to use the environment texture (HDRI) for reflections and lighting, but also see my original backplate through the refractive objects?

thanks in advance
cheers
ben