That only works for profiles where vorpX has other means of applying head tracking than emulating a mouse, which is not the case for Stalker unfortunately. With moused based tracking vorpX would have to know when you are in a menu or inventory screen.
What helps a lot however is switching to EdgePeek mode while using menus or invetory screens, which is more comfortable anyway. That way you can see the whole screen and don’t have to look around while using the menu. Edgepeek can be enabled by pressing the mousewheel, the left gamepad thumbstick or the right grip button on your VR controller.