I think that it's worth remembering that the Pevensies may be Narnian down to their blood and bone, but this isn't their Narnia.

Yes this! I wonder how your Jill and Lucy would connect in that regard, Lucy being the only of the Pevensies to emphatically say that they shouldn't be here - that as a sort of recognition of it not being their Narnia, or at least not their time. It's a cool and complex tension between the fact of Peter being High King over all kings etc etc, their definite ties to and devotion to Narnian, and the fact that, as you say, this isn't their Narnia anymore.