Hi.
No, only 1 scene but 2 prefabs from the player.
The right hand player standard in the scene and the Left hand player in a resource folder.
Just to be sure, do the enemies also need to change when left hand is chosen?
If so maybe it would be better you mirror the camera
and flip the controls
Place the attachment i included on your camera.
If this is what you need i can make an action for it