I've done it before on a different application by trial and error with a pipe tap on a nut to get it to screw on the thread a bit deeper each time until it cinches down in the correct orientation. This was not an oil pickup on a motor, surprising what you will try in order to get a production line up and running at 2am. I don't think I would try that though in this instance. Sure as hell it's going to loosen up at some point. I think I'd be inclined to get it in the correct orientation and weld a tab on that goes to one of the main cap or windage tray bolts to hold it where it needs to be.
