I still don't know exactly what you have in mind when you want to route something to the "soundcard's output", but in the end it is all up to your DAW, really.
Yeah, the access I'm after might just be complicating things too much. One solution that might be easier which is kind of meeting the issue half way would be to have one master EQ for the wet signal (and why not one for the Dry Signal too actually).
Uhm ... Maybe I just don't get the point - but this is exactly what the RoomEQ is meant to do: Changing the sound of the wet signal component only. The dry signal can be EQed before you process it with MIR.
Kind regards,
/Dietz - Vienna Symphonic Library