I think I understand what you mean.
Maybe the visons should be not the real psy, just visions not possible to control, not possible to switch on/off when wanted. Just like a watcher of a surveilance camera.
If you want to avoid the "real psy" just stop there and say this "brought a first glance into an unknown communication method of the aliens". Only after some research, way after your story this lead to the Xenonauts Psy-program. The protagonist hands over the device after all research that is possible on that level has been done and can go his way, free of dread and visions.