I mean, canonically, isn't Wesley basically a Q at this point, doesn't he have Phenomenal Cosmic Powers™? Wesley disguising himself as Nog shouldn't be too hard to do. Hell, it was in a holosuite, and if anyone can rig one of those, it's Wesley.
So, what I'm saying is...canonically, there is no reason that it couldn't have been Wesley hanging out with Jake...
Wow. And Paper Moon is legitimately one of my favorite episodes that doesn't get a lot of fanfare. Replacing Nog for Wesley mentally is something I can not conceive of in that.