I would definitely read nineteen more chapters of this, if just so that I can see the confrontation in the other world if they really were just switched.
Okay, really, I'd still read nineteen more even if that weren't the case. This has the potential to be very amusing.
Author's response
Don't expect it to be all jollies and wisecracks, I warn you.
There'll be amusement, especially with Tonks, but there will also be some very creepy and depressing stuff going down too.
(but thanks for the kudos, though! I forgot to say before I hit "respond," sorry!)