It would be wondeful to not take rules literally as written. That would mean that Adunaphel can target any character.
There's nothing in either card text that overrides the rule for winning by the One Ring that you must have moved the One Ring to Mount Doom. All the card text does is indicate that it is a card to which the rule can apply -- the rule mentions no card by name, but applies to any instances of winning with the One Ring at Mount Doom by the play of certain cards.
Edit: The Playability conditions are not added permissions, they are added restrictions. For example, Riders of Rohan states "Playable at Edoras", but this does not mean that all the normal rules applying to playing a faction are overturned -- it must still be in the site phase, you must tap the character and the site, etc. Playable at Edoras is a further limitation to normal faction play, not an abrogation of it.