Why not?
Meself - but that's only me - if I wanted to do this at the end, I'd "frame" the story, by starting it with an external, knowledgeable narrator's PoV as well. That gets the reader reading the story the right way, and when we return to it at the end, it'll feel like a return - a rounding-off - not a sudden move into unknown territory. And I would consider making it - say - two sentences top and bottom, not one, just to make sure that the effect is properly effective, not half-hearted IYSWIM.
(And then I would, personally, probably be sorely tempted to make use of that external narrator's pov as well in a couple of other places, because it's so useful. But that's just me, because I'm as addicted now to the relationship between external narrators and internal characters, as I used to be to first-person character narrators. It would change the feel of the story rather more.)
I don't think a lot of readers notice these bloomin things anyway |
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Not consciously, but that doesn't mean it doesn't affect how they experience the story - see head-hopping (which of course is very different from a controlled and confident use of moving point-of-view), which lots of readers won't notice, just fail to be as gripped and convinced by the story as they would if the pov-moves had been properly handled.