Hey to-someplace-else! I did actually do a little bit more on that a few days later, though I failed to link it from the original post, but considering it’s been almost two years since I posted those I could definitely touch back on the idea.
I think maybe the main problem–besides not having a firm enough idea of when in the HP timeline to do it–is that a few months later the Descendants x Narnia crossover idea struck me and overall that one feels more cohesive.
Don’t get me wrong, I will always be very pleased with the “just Harry” and “Harry the Just” connection, but as an adventure or, maybe, as a set of character developments, it works better with Descendants. Or, perhaps, the four Lost Kids of Descendants “need” the character developments from a Narnia crossover than the four HP kids do.
Like, the HP series is far from perfect, but the personal growth that the Golden Trio and Neville (which is it’s own sticking point, Neville being the odd man out, that the Descendants version doesn’t have) have over the course of it is one of things that I wouldn’t want alter too much. A Golden Trio+Neville (the Golden Quartet?) come back from ruling Narnia in their first or second year would be vastly different from canon and have almost too many butterfly effects that would render the HP series unrecognizable.
Unless for some reason they decided to keep it secret, but then the story would be about those small moments in which the Golden Quartet do decide to utilize what they learned and it doesn’t make much sense for them to do that? Like, given their Gryffindor natures, the only one who would be vaguely subtle about it might be Hermione, but even then she canonically held Rita Skeeter captive in a jar as a fourteen year old–no way would a grown queen version of her used to warfare not want to immediately hunt down and destroy Voldemort and his Death Eaters immediately.
… although now that I say this… what if it’s NOT the Golden Quartet who went? That is, what if it’s not a bunch of brash Gryffindors who would immediately enact justice upon returning, no matter their situation upon returning?
What if it’s a bunch of Slytherins? And Narnia-prophecy wise it would work better: Draco, Blaise, Pansy, and Millicent or Daphne. There wouldn’t really be an odd man out like with the Golden Trio + Neville because except for Pansy’s sycophancy towards Draco (which may very well be a reputation thing) they’re all fairly individualistic. And upon coming back it would make sense that they keep quiet about it because while Voldemort might be evil, the Death Eaters are their parents. The Slytherins would be highly aware of the “real world” and societal limitations on them that a Golden Quartet wouldn’t.
But then that edges a bit into what I like about Once Then Always in that four kids of villains can become heroes. And whereas in the HP series it would just butterfly effect in different ways, in Descendants it would add an additional layer.
Although I suppose something similar could be done if the Hogwarts Founders were the Digory and Polly equivalents? But even then there’s not much need for a crossover with The Chronicles of Narnia–the HP ‘verse has more than enough material to do something similar…
Sorry that’s pretty much all I’ve got for this particular thread, to-someplace-else.