Gamelift + Steam OSS + Oculus OSS

recently I have implemented Gamelift Linux dedicated servers for our game successfully, that earlier supported listen server hosting both on Steam and Oculus (because it is sold in these 2 stores).
Is there any chance to keep the old listen server hosting features somehow? I see a conflict between Gamelift netdriver settings and any OSS, which are set in DefaultEngine.ini. Is it possible to set them from code runtime?