Inspire is a verb; enhearten is an outcome?
Scan, well, okay, but Search seems more apt.
Enhearten is also a verb, and was used that way in the quote from RotK that Mythicos gave us. I suppose the noun form would be "enheartenment" if that came up, though I doubt it ever would. It is an unusual word, but no better replacement for Inspire leaps to mind, keeping in mind the need that it echo Tolkien's own writing.
Best guess I have seen in the TOR/AiME discord for a reason to change Search is the sense that to some people it seemed to overlap Explore too much, and I can see how Scan does that less (but only a little less). I am a bit stumped for this choice. I wonder if Seek was considered, but I think it also would be eliciting similarly negative responses. (Seek, search, and scan can all be used in a high-tech context, of course, but they all also can be used in other contexts. I think whether it feels counter-immersive depends on what someone's exposure to it is.)