>>337349890
https://ovrmc.dschadu.de/ can kind of do it, though it's geared towards compensating for motion of a simulator, not just arbitrarily rotating your playspace. You may be able to mess around with the config to set an arbitrary rotation however.

IIRC OVR advanced settings wont't build functionality for changing roll and pitch, only yaw, due to limitations of the default steamvr driver. You have to emulate the whole headset to change roll/pitch.