Hee, it's something I've seen done once or twice in Merlin fandom, but probably because that fandom lends itself to non-magical AUs more easily for some reason. I think with the H/D pairing, there is a lot of room to play in JKR's world and maybe that's why some writers don't like to branch out in our plain old Muggle realm.

Now we just have to poke you for SS!Draco and stalwart!brit!soldier!Harry. :D