What is the proper request to make for removal of an alien portal in a location? We assume it should not simply be moved to a safe distance but dealt with in some other way, perhaps more thorough. Is that correct?

This is correct. These interlopers do not belong nor does their technology. So simply requesting that the alien portal be removed, and all its effects healed will take care of things nicely because the divine realm will know what to do with the energy it represents, and having it taken away is the goal, as well as healing what it may have caused. Those are the main considerations from the human end of things. In actuality, it is removed and transmuted energetically, so it is rendered null and void for their purposes and that is as it should be. It is sort of like turning into the spoils of war. If you leave your goodies behind, others will take them and repurpose them, turning swords into plowshares, selling them off to the civilian populace as mementos or melting things down to reuse the component materials for another purpose. But these are not returnable and that again is as it should be. When an invader attempts to conquer but is then driven out, they cannot justly demand return of any abandoned weaponry. They forfeit that right with their act of aggression.