As far as I know, there isn't.
That's really bad, because I planned to do something like that several times. Now I'll probably have to limit myself to gates or come up with something with quests... maybe I can lead the hero to the Seekers' house, and he'll disappear there? In essence, there are quests for artifacts, but in this case, you need to deliver the hero.
And the second thing isn't so important, although it might be useful. I was originally planning for a neutral hero... I understand about the stealth, but I don't know, what if someone has the Scouting skill?)))